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major rework

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This commit is contained in:
Ole Morud
2026-01-03 16:22:42 +01:00
parent 4998a057f5
commit 716527fa8f
14 changed files with 2431 additions and 2261 deletions
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1
.gitignore vendored
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@@ -5,3 +5,4 @@ mbb_rook.h
tests tests
*.dSYM *.dSYM
between_lookup.h between_lookup.h
diagonals.h

16
Makefile
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@@ -3,14 +3,14 @@ BUILD ?= debug
CC := clang CC := clang
CFLAGS.gcc := -std=c23 -Wall -Wextra -Wconversion -Wno-unused-function CFLAGS.gcc := -std=c23 -Wall -Wextra -Wconversion -Wno-unused-function
CFLAGS.gcc.release := -Ofast CFLAGS.gcc.release := -Ofast -march=native -DNDEBUG
CFLAGS.gcc.debug := -ggdb -O0 -fsanitize=address CFLAGS.gcc.debug := -ggdb -O0 -fsanitize=address
CFLAGS.clang := -std=c23 -Wall -Wextra -Wconversion -Wno-unused-function -Wimplicit-int-conversion CFLAGS.clang := -std=c23 -g -Wall -Wextra -Wconversion -Wno-unused-function -Wimplicit-int-conversion
CFLAGS.clang.release := -Ofast -march=native CFLAGS.clang.release := -O3 -ffast-math -march=native # -DNDEBUG
CFLAGS.clang.debug := -ggdb -O0 -fsanitize=address CFLAGS.clang.debug := -g3 -O0 -fsanitize=address
CFLAGS.clang.wasm := \ CFLAGS.clang.wasm := \
--target=wasm32-unknown-unknown -O3 -nostdlib \ --target=wasm32-unknown-unknown -nostdlib -g \
-Wl,--export-all \ -Wl,--export-all \
-Wl,--no-entry -Wl,--no-entry
@@ -23,8 +23,8 @@ wasm: chess.wasm
codegen: codegen.c codegen: codegen.c
$(CC) -o $@ $(CFLAGS) $^ $(CC) -o $@ $(CFLAGS) $^
chess.wasm: wasm-compat.c chess.wasm: wasm-compat-chatgpt.c mbb_rook.h mbb_bishop.h engine.h
$(CC) -DWASM -o $@ wasm-compat.c $(CFLAGS.$(CC)) $(CFLAGS.$(CC).wasm) $(CC) -DWASM -o $@ wasm-compat-chatgpt.c $(CFLAGS.$(CC)) $(CFLAGS.$(CC).wasm)
mbb_rook.h: codegen mbb_rook.h: codegen
./codegen ./codegen
@@ -33,4 +33,4 @@ mbb_bishop.h: codegen
./codegen ./codegen
tests: tests.c mbb_rook.h mbb_bishop.h engine.h tests: tests.c mbb_rook.h mbb_bishop.h engine.h
$(CC) -o $@ $(CFLAGS) tests.c $(CC) -o $@ $(CFLAGS) -DUSE_PRINTF tests.c

142
board_print.h
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@@ -1,3 +1,4 @@
#pragma once
#include <ctype.h> #include <ctype.h>
#include <locale.h> #include <locale.h>
@@ -9,15 +10,15 @@
#define INDEX_FMT PRIu8 #define INDEX_FMT PRIu8
static void bitboard_print(bitboard b, FILE* out) static void bitboard_print(Bb64 b, FILE* out)
{ {
setlocale(LC_ALL, ""); setlocale(LC_ALL, "");
fprintf(out, "\n"); fprintf(out, "\n");
for (index i = 7; i < 8; i--) { for (Index8 i = 7; i < 8; i--) {
fprintf(out, "\033[0m"); /* reset background color */ fprintf(out, "\033[0m"); /* reset background color */
fprintf(out, "%"INDEX_FMT" ", i+1); fprintf(out, "%"INDEX_FMT" ", i+1);
for (index j = 0; j < 8; ++j) { for (Index8 j = 0; j < 8; ++j) {
index const n = INDEX_FROM_RF(i,j); Index8 const n = SQ_FROM_RF(i,j);
int color; int color;
if ((b >> n) & 1) { if ((b >> n) & 1) {
/* 41: red */ /* 41: red */
@@ -35,59 +36,6 @@ static void bitboard_print(bitboard b, FILE* out)
fprintf(out, " A B C D E F G H \n"); fprintf(out, " A B C D E F G H \n");
} }
static void board_print_threats(const struct pos* pos, FILE* out, struct move* move)
{
enum player const player = pos->player;
int buf[8][8] = {0};
bitboard const threats = all_threats_from_player(pos, player);
for (enum player player = PLAYER_BEGIN; player < PLAYER_COUNT; ++player) {
for (enum piece piece = PIECE_BEGIN; piece < PIECE_COUNT; ++piece) {
bitboard x = pos->pieces[player][piece];
for (index i = 7; i < 8; i--) {
for (index j = 0; j < 8; ++j) {
if (x & (1ULL<<(i*8+j))) {
buf[i][j] = piece_unicode[player][piece];
}
}
}
}
}
/* see: https://en.wikipedia.org/wiki/ANSI_escape_code#Colors */
setlocale(LC_ALL, ""); /* needed for unicode symbols */
for (index i = 7; i < 8; i--) {
fprintf(out, "\033[0m"); /* reset background color */
fprintf(out, "%"INDEX_FMT" ", i+1);
for (index j = 0; j < 8; ++j) {
index const n = INDEX_FROM_RF(i,j);
if (move && n == move->from) {
fprintf(out, "\033[%d;%dm", 30, 44); /* 44: blue*/
} else if (move && n == move->to) {
fprintf(out, "\033[%d;%dm", 30, 44); /* 104: bright blue*/
}
else if ((threats >> n) & 1) {
fprintf(out, "\033[%d;%dm", 30, 41); /* 41: red */
} else {
/* 45: magenta, 47: white */
fprintf(out, "\033[%d;%dm", 30, (i+j) % 2 ? 45 : 47);
}
if (buf[i][j]) {
fprintf(out, "%lc ", buf[i][j]);
} else {
fprintf(out, " "); /* idk why this hack is needed but "%lc "
is not working when buf[i][j] = ' ' */
}
}
fprintf(out, "\033[0m"); /* reset background color */
fprintf(out, "\n");
}
fprintf(out, " A B C D E F G H \n");
}
static void tt_print_stats(struct tt* tt, FILE* out) static void tt_print_stats(struct tt* tt, FILE* out)
{ {
#ifndef NDEBUG #ifndef NDEBUG
@@ -105,6 +53,7 @@ static void tt_print_stats(struct tt* tt, FILE* out)
fprintf(out, "tt insertions: %"PRIu64"\n", tt->insertions); fprintf(out, "tt insertions: %"PRIu64"\n", tt->insertions);
fprintf(out, "saturation: %.02lf\n", pct); fprintf(out, "saturation: %.02lf\n", pct);
#else #else
(void)tt;
fprintf(out, "stats not available with NDEBUG\n"); fprintf(out, "stats not available with NDEBUG\n");
#endif #endif
} }
@@ -113,14 +62,14 @@ static void board_print_fen(struct pos const* pos, FILE* out)
{ {
int buf[8][8] = {0}; int buf[8][8] = {0};
for (enum player player = PLAYER_BEGIN; player < PLAYER_COUNT; ++player) { for (Side8 side = SIDE_BEGIN; side < SIDE_COUNT; ++side) {
for (enum piece piece = PIECE_BEGIN; piece < PIECE_COUNT; ++piece) { for (Piece8 piece = PIECE_BEGIN; piece < PIECE_COUNT; ++piece) {
bitboard x = pos->pieces[player][piece]; Bb64 x = pos->pieces[side][piece];
for (index i = 7; i < 8; i--) { for (Index8 i = 7; i < 8; i--) {
for (index j = 0; j < 8; ++j) { for (Index8 j = 0; j < 8; ++j) {
if (x & (1ULL<<(i*8+j))) { if (x & (1ULL<<(i*8+j))) {
buf[i][j] = piece_char[player][piece]; buf[i][j] = piece_char[side][piece];
} }
} }
} }
@@ -147,22 +96,22 @@ static void board_print_fen(struct pos const* pos, FILE* out)
fprintf(out, "/"); fprintf(out, "/");
} }
fprintf(out, " %c ", pos->player == PLAYER_WHITE ? 'w' : 'b'); fprintf(out, " %c ", pos->moving_side == SIDE_WHITE ? 'w' : 'b');
bool any_castle = false; bool any_castle = false;
if (!pos->castling_illegal[PLAYER_WHITE][CASTLE_KINGSIDE]) { if (!pos->castling_illegal[SIDE_WHITE][CASTLE_KINGSIDE]) {
fprintf(out, "K"); fprintf(out, "K");
any_castle = true; any_castle = true;
} }
if (!pos->castling_illegal[PLAYER_WHITE][CASTLE_QUEENSIDE]) { if (!pos->castling_illegal[SIDE_WHITE][CASTLE_QUEENSIDE]) {
fprintf(out, "Q"); fprintf(out, "Q");
any_castle = true; any_castle = true;
} }
if (!pos->castling_illegal[PLAYER_BLACK][CASTLE_KINGSIDE]) { if (!pos->castling_illegal[SIDE_BLACK][CASTLE_KINGSIDE]) {
fprintf(out, "k"); fprintf(out, "k");
any_castle = true; any_castle = true;
} }
if (!pos->castling_illegal[PLAYER_BLACK][CASTLE_QUEENSIDE]) { if (!pos->castling_illegal[SIDE_BLACK][CASTLE_QUEENSIDE]) {
fprintf(out, "q"); fprintf(out, "q");
any_castle = true; any_castle = true;
} }
@@ -172,18 +121,18 @@ static void board_print_fen(struct pos const* pos, FILE* out)
if (pos->ep_targets) { if (pos->ep_targets) {
/* should be ep target square in algebraic notation */ /* should be ep target square in algebraic notation */
enum square_index const sqi = bitboard_lsb(pos->ep_targets); Sq8 const sqi = bitboard_lsb(pos->ep_targets);
assert(sqi >= SQ_INDEX_BEGIN && sqi < SQ_INDEX_COUNT); assuming(sqi >= SQ_BEGIN && sqi < SQ_COUNT);
enum file_index const fi = index_to_file(sqi); enum file_index const fi = sq_to_file(sqi);
enum rank_index const ri = index_to_rank(sqi); enum rank_index const ri = sq_to_rank(sqi);
int const fch = tolower(file_index_char[fi]); int const fch = tolower(file_index_char[fi]);
int const rch = tolower(rank_index_char[ri]); int const rch = tolower(rank_index_char[ri]);
assert(fch >= 'a' && fch <= 'h'); assuming(fch >= 'a' && fch <= 'h');
assert(rch >= '1' && rch <= '8'); assuming(rch >= '1' && rch <= '8');
fprintf(out, " %c%c", fch, rch); fprintf(out, " %c%c", fch, rch);
} else { } else {
@@ -196,20 +145,20 @@ static void board_print_fen(struct pos const* pos, FILE* out)
fprintf(out, "\n"); fprintf(out, "\n");
} }
static void board_print(const struct pos* pos, struct move* move, FILE* out) static void board_print(struct pos const* pos, struct move* move, FILE* out, bool print_threats)
{ {
int buf[8][8] = {0}; int buf[8][8] = {0};
int color[8][8] = {0}; int color[8][8] = {0};
for (enum player player = PLAYER_BEGIN; player < PLAYER_COUNT; ++player) { for (Side8 side = SIDE_BEGIN; side < SIDE_COUNT; ++side) {
for (enum piece piece = PIECE_BEGIN; piece < PIECE_COUNT; ++piece) { for (Piece8 piece = PIECE_BEGIN; piece < PIECE_COUNT; ++piece) {
bitboard x = pos->pieces[player][piece]; Bb64 x = pos->pieces[side][piece];
for (index i = 7; i < 8; i--) { for (Index8 i = 7; i < 8; i--) {
for (index j = 0; j < 8; ++j) { for (Index8 j = 0; j < 8; ++j) {
if (x & (1ULL<<(i*8+j))) { if (x & (1ULL<<(i*8+j))) {
buf[i][j] = piece_unicode[PLAYER_BLACK][piece]; buf[i][j] = piece_unicode[SIDE_BLACK][piece];
color[i][j] = (player == PLAYER_WHITE) color[i][j] = (side == SIDE_WHITE)
? 1 ? 1
: 2; : 2;
} }
@@ -218,16 +167,19 @@ static void board_print(const struct pos* pos, struct move* move, FILE* out)
} }
} }
Bb64 const threats = all_threats_from_side(pos, pos->moving_side);
/* see: https://en.wikipedia.org/wiki/ANSI_escape_code#Colors */ /* see: https://en.wikipedia.org/wiki/ANSI_escape_code#Colors */
setlocale(LC_ALL, ""); setlocale(LC_ALL, "");
for (index i = 7; i < 8; i--) { for (Index8 i = 7; i < 8; i--) {
fprintf(out, "\033[0m"); /* reset background color */ fprintf(out, "\033[0m"); /* reset background color */
fprintf(out, "%"INDEX_FMT" ", i+1); fprintf(out, "%"INDEX_FMT" ", i+1);
for (index j = 0; j < 8; ++j) { for (Index8 j = 0; j < 8; ++j) {
index const n = INDEX_FROM_RF(i,j); Index8 const n = SQ_FROM_RF(i,j);
int bg, fg; int bg, fg;
/* foreground color */
/**/ if (color[i][j] == 1) { /**/ if (color[i][j] == 1) {
fg = 97; /* bright white */ fg = 97; /* bright white */
} }
@@ -238,14 +190,20 @@ static void board_print(const struct pos* pos, struct move* move, FILE* out)
fg = 35; /* magenta (should not happen) */ fg = 35; /* magenta (should not happen) */
} }
if (move && n == move->from) { /* background color */
bg = 104; /* blue */ /**/ if (move && (n == move->to || n == move->from)) {
} else if (move && n == move->to) {
bg = 44; /* bright blue */ bg = 44; /* bright blue */
}
else if (print_threats && (threats >> n) & 1) {
bg = 41;
} else { } else {
/* 45: magenta, /* 45: magenta,
* 47: white */ * 43: yellow */
bg = (i+j) % 2 ? 45 : 47; bg = (i+j) % 2 ? 45 : 43;
}
if ((pos->occupied[SIDE_WHITE] | pos->occupied[SIDE_BLACK]) & MASK_FROM_SQ(n)) {
bg += 60; /* make bright */
} }
fprintf(out, "\033[%d;%dm", fg, bg); fprintf(out, "\033[%d;%dm", fg, bg);
@@ -261,5 +219,9 @@ static void board_print(const struct pos* pos, struct move* move, FILE* out)
fprintf(out, "\n"); fprintf(out, "\n");
} }
fprintf(out, " A B C D E F G H \n"); fprintf(out, " A B C D E F G H \n");
fprintf(out, "half moves: %d\n"
"full moves: %d\n",
pos->halfmoves,
pos->fullmoves);
} }

118
codegen.c
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@@ -5,66 +5,48 @@
#include <stdlib.h> #include <stdlib.h>
#include <stdio.h> #include <stdio.h>
/* gets the next number with the same bitcount, unless it overflows, in which
* it returns the first number with popcount+1 */
uint64_t next_magic(uint64_t seed) {
uint64_t u = seed & -seed; // rightmost 1-bit
uint64_t v = seed + u; // add it
if (v == 0) {
if (seed == ~0ULL) {
return 0;
}
return next_magic((1ULL << (popcount(seed)+1)) - 1);
}
seed = v + (((v ^ seed) / u) >> 2);
return seed;
}
int main() int main()
{ {
struct magic rook_magics[SQ_INDEX_COUNT] = {0ULL}; struct magic rook_magics[SQ_COUNT] = {0ULL};
bitboard rook_attacks[SQ_INDEX_COUNT][1<<12ULL] = {0}; Bb64 rook_attacks[SQ_COUNT][1<<12ULL] = {0};
index rook_relevant_bits[12] = {0}; Index8 rook_relevant_bits[12] = {0};
size_t rook_relevant_bits_count = 0; size_t rook_relevant_bits_count = 0;
struct magic bishop_magics[SQ_INDEX_COUNT] = {0ULL}; struct magic bishop_magics[SQ_COUNT] = {0ULL};
bitboard bishop_attacks[SQ_INDEX_COUNT][1<<9ULL] = {0}; Bb64 bishop_attacks[SQ_COUNT][1<<9ULL] = {0};
index bishop_relevant_bits[9] = {0}; Index8 bishop_relevant_bits[9] = {0};
size_t bishop_relevant_bits_count = 0; size_t bishop_relevant_bits_count = 0;
bitboard between_lookup[SQ_INDEX_COUNT][SQ_INDEX_COUNT]; Bb64 between_lookup[SQ_COUNT][SQ_COUNT];
bitboard diagonals[SQ_INDEX_COUNT]; Bb64 diagonals[SQ_COUNT];
for (enum square_index sq = SQ_INDEX_BEGIN; sq < SQ_INDEX_COUNT; ++sq) { for (Sq8 sq = SQ_BEGIN; sq < SQ_COUNT; ++sq) {
diagonals[sq] = diagonals_from_index(sq); diagonals[sq] = diagonals_from_index(sq);
} }
for (enum square_index sq_index = SQ_INDEX_BEGIN; sq_index < SQ_INDEX_COUNT; ++sq_index) { for (Sq8 sq_index = SQ_BEGIN; sq_index < SQ_COUNT; ++sq_index) {
enum file_index file = index_to_file(sq_index); enum file_index file = sq_to_file(sq_index);
enum rank_index rank = index_to_rank(sq_index); enum rank_index rank = sq_to_rank(sq_index);
fprintf(stderr, "%s ", square_index_display[sq_index]); fprintf(stderr, "%s ", sq8_display[sq_index]);
/* ROOKS /* ROOKS
* ======================= */ * ======================= */
{ {
/* generate attack mask */ /* generate attack mask */
bitboard atk_mask = 0; Bb64 atk_mask = 0;
{ {
atk_mask |= FILE_MASK(file) & ~(RANK_MASK_1 | RANK_MASK_8); atk_mask |= FILE_MASK(file) & ~(RANK_MASK_1 | RANK_MASK_8);
atk_mask |= RANK_MASK(rank) & ~(FILE_MASK_A | FILE_MASK_H); atk_mask |= RANK_MASK(rank) & ~(FILE_MASK_A | FILE_MASK_H);
atk_mask &= ~SQ_MASK_FROM_RF(rank, file); atk_mask &= ~MASK_FROM_RF(rank, file);
/* populate relevant bits array */ /* populate relevant bits array */
rook_relevant_bits_count = 0; rook_relevant_bits_count = 0;
bitboard x = atk_mask; Bb64 x = atk_mask;
while (x) { while (x) {
const index lsb = bitboard_pop_lsb(&x); Sq8 const lsb = bitboard_pop_lsb(&x);
rook_relevant_bits[rook_relevant_bits_count++] = lsb; rook_relevant_bits[rook_relevant_bits_count++] = lsb;
} }
} }
@@ -72,12 +54,12 @@ int main()
/* brute force the magic number */ /* brute force the magic number */
for (;;) { for (;;) {
bitboard magic = my_rand64() & my_rand64() & my_rand64(); Bb64 magic = my_rand64() & my_rand64() & my_rand64();
bitboard atk = 0ULL; Bb64 atk = 0ULL;
for (bitboard test = 0; test < (1ULL<<rook_relevant_bits_count); test++) { for (Bb64 test = 0; test < (1ULL<<rook_relevant_bits_count); test++) {
/* map test to an occupany set */ /* map test to an occupany set */
bitboard occ = 0ULL; Bb64 occ = 0ULL;
for (size_t i = 0; i < rook_relevant_bits_count; i++) { for (size_t i = 0; i < rook_relevant_bits_count; i++) {
occ |= ((test >> i) & 1ULL) << rook_relevant_bits[i]; occ |= ((test >> i) & 1ULL) << rook_relevant_bits[i];
} }
@@ -108,32 +90,32 @@ int main()
* ====================== */ * ====================== */
{ {
/* generate attack mask */ /* generate attack mask */
bitboard atk_mask = 0; Bb64 atk_mask = 0;
{ {
atk_mask |= diagonals_from_index(sq_index); atk_mask |= diagonals_from_index(sq_index);
atk_mask &= ~(RANK_MASK_1 | RANK_MASK_8); atk_mask &= ~(RANK_MASK_1 | RANK_MASK_8);
atk_mask &= ~(FILE_MASK_A | FILE_MASK_H); atk_mask &= ~(FILE_MASK_A | FILE_MASK_H);
atk_mask &= ~SQ_MASK_FROM_RF(rank, file); atk_mask &= ~MASK_FROM_RF(rank, file);
/* populate relevant bits array */ /* populate relevant bits array */
bishop_relevant_bits_count = 0; bishop_relevant_bits_count = 0;
bitboard x = atk_mask; Bb64 x = atk_mask;
while (x) { while (x) {
const index lsb = bitboard_pop_lsb(&x); Sq8 const lsb = bitboard_pop_lsb(&x);
bishop_relevant_bits[bishop_relevant_bits_count++] = lsb; bishop_relevant_bits[bishop_relevant_bits_count++] = lsb;
} }
} }
bishop_magics[sq_index].mask = atk_mask; bishop_magics[sq_index].mask = atk_mask;
/* brute force the magic number */ /* brute force the magic number */
bitboard magic = 0ULL; Bb64 magic = 0ULL;
for (;;) { for (;;) {
magic = my_rand64() & my_rand64() & my_rand64(); magic = my_rand64() & my_rand64() & my_rand64();
bitboard atk = 0ULL; Bb64 atk = 0ULL;
for (bitboard test = 0; test < (1ULL<<bishop_relevant_bits_count); test++) { for (Bb64 test = 0; test < (1ULL<<bishop_relevant_bits_count); test++) {
/* map test to an occupany set */ /* map test to an occupany set */
bitboard occ = 0ULL; Bb64 occ = 0ULL;
for (size_t i = 0; i < bishop_relevant_bits_count; i++) { for (size_t i = 0; i < bishop_relevant_bits_count; i++) {
occ |= ((test >> i) & 1ULL) << bishop_relevant_bits[i]; occ |= ((test >> i) & 1ULL) << bishop_relevant_bits[i];
} }
@@ -161,8 +143,8 @@ int main()
/* BETWEEN TABLE /* BETWEEN TABLE
* ===================== */ * ===================== */
{ {
for (enum square_index i = SQ_INDEX_BEGIN; i < SQ_INDEX_COUNT; ++i) { for (Sq8 i = SQ_BEGIN; i < SQ_COUNT; ++i) {
for (enum square_index j = SQ_INDEX_BEGIN; j < SQ_INDEX_COUNT; ++j) { for (Sq8 j = SQ_BEGIN; j < SQ_COUNT; ++j) {
between_lookup[i][j] = between_mask(i, j); between_lookup[i][j] = between_mask(i, j);
} }
} }
@@ -180,10 +162,10 @@ int main()
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
fprintf(f, "static const bitboard diagonals[SQ_INDEX_COUNT] = {\n"); fprintf(f, "static const Bb64 diagonals[SQ_COUNT] = {\n");
for (enum square_index i = SQ_INDEX_BEGIN; i < SQ_INDEX_COUNT; ++i) { for (Sq8 i = SQ_BEGIN; i < SQ_COUNT; ++i) {
fprintf(f, "[%s] = 0x%016"BITBOARD_FMT_X",\n", fprintf(f, "[%s] = 0x%016"BITBOARD_FMT_X",\n",
square_index_str[i], sq8_str[i],
diagonals[i]); diagonals[i]);
} }
fprintf(f,"};\n"); fprintf(f,"};\n");
@@ -198,15 +180,15 @@ int main()
} }
fprintf(f, "#pragma once\n"); fprintf(f, "#pragma once\n");
fprintf(f, "static const struct magic mbb_rook[SQ_INDEX_COUNT] = {\n"); fprintf(f, "static const struct magic mbb_rook[SQ_COUNT] = {\n");
for (enum square_index i = SQ_INDEX_BEGIN; i < SQ_INDEX_COUNT; i++) { for (Sq8 i = SQ_BEGIN; i < SQ_COUNT; i++) {
fprintf(f, fprintf(f,
TAB "[%s] = (struct magic) {" TAB "[%s] = (struct magic) {"
NL TAB " .magic = 0x%016"BITBOARD_FMT_X"ULL," NL TAB " .magic = 0x%016"BITBOARD_FMT_X"ULL,"
NL TAB " .mask = 0x%016"BITBOARD_FMT_X"ULL," NL TAB " .mask = 0x%016"BITBOARD_FMT_X"ULL,"
NL TAB "}," NL TAB "},"
NL, NL,
square_index_str[i], sq8_str[i],
rook_magics[i].magic, rook_magics[i].magic,
rook_magics[i].mask); rook_magics[i].mask);
} }
@@ -214,9 +196,9 @@ int main()
fprintf(f,"\n"); fprintf(f,"\n");
fprintf(f, "static const bitboard rook_attacks[SQ_INDEX_COUNT][1ULL<<12ULL] = {\n"); fprintf(f, "static const Bb64 rook_attacks[SQ_COUNT][1ULL<<12ULL] = {\n");
for (enum square_index sq = SQ_INDEX_BEGIN; sq < SQ_INDEX_COUNT; ++sq) { for (Sq8 sq = SQ_BEGIN; sq < SQ_COUNT; ++sq) {
fprintf(f, "[%s] = {\n", square_index_str[sq]); fprintf(f, "[%s] = {\n", sq8_str[sq]);
for (size_t i = 0; i < sizeof rook_attacks[sq] / sizeof *rook_attacks[sq]; i++) { for (size_t i = 0; i < sizeof rook_attacks[sq] / sizeof *rook_attacks[sq]; i++) {
fprintf(f, "0x%016"BITBOARD_FMT_X"ULL, \n", rook_attacks[sq][i]); fprintf(f, "0x%016"BITBOARD_FMT_X"ULL, \n", rook_attacks[sq][i]);
} }
@@ -235,15 +217,15 @@ int main()
} }
fprintf(f, "\n"); fprintf(f, "\n");
fprintf(f, "static const struct magic mbb_bishop[SQ_INDEX_COUNT] = {\n"); fprintf(f, "static const struct magic mbb_bishop[SQ_COUNT] = {\n");
for (enum square_index i = SQ_INDEX_BEGIN; i < SQ_INDEX_COUNT; i++) { for (Sq8 i = SQ_BEGIN; i < SQ_COUNT; i++) {
fprintf(f, fprintf(f,
TAB "[%s] = (struct magic) {" TAB "[%s] = (struct magic) {"
NL TAB " .magic = 0x%016"BITBOARD_FMT_X"ULL," NL TAB " .magic = 0x%016"BITBOARD_FMT_X"ULL,"
NL TAB " .mask = 0x%016"BITBOARD_FMT_X"ULL," NL TAB " .mask = 0x%016"BITBOARD_FMT_X"ULL,"
NL TAB "}," NL TAB "},"
NL, NL,
square_index_str[i], sq8_str[i],
bishop_magics[i].magic, bishop_magics[i].magic,
bishop_magics[i].mask); bishop_magics[i].mask);
} }
@@ -251,9 +233,9 @@ int main()
fprintf(f,"\n"); fprintf(f,"\n");
fprintf(f, "static const bitboard bishop_attacks[SQ_INDEX_COUNT][1ULL<<9ULL] = {\n"); fprintf(f, "static const Bb64 bishop_attacks[SQ_COUNT][1ULL<<9ULL] = {\n");
for (enum square_index sq = SQ_INDEX_BEGIN; sq < SQ_INDEX_COUNT; ++sq) { for (Sq8 sq = SQ_BEGIN; sq < SQ_COUNT; ++sq) {
fprintf(f, "[%s] = {\n", square_index_str[sq]); fprintf(f, "[%s] = {\n", sq8_str[sq]);
for (size_t i = 0; i < sizeof bishop_attacks[sq] / sizeof *bishop_attacks[sq]; i++) { for (size_t i = 0; i < sizeof bishop_attacks[sq] / sizeof *bishop_attacks[sq]; i++) {
fprintf(f, "0x%016"BITBOARD_FMT_X"ULL, \n", bishop_attacks[sq][i]); fprintf(f, "0x%016"BITBOARD_FMT_X"ULL, \n", bishop_attacks[sq][i]);
} }
@@ -270,10 +252,10 @@ int main()
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
fprintf(f, "static const bitboard between_lookup[SQ_INDEX_COUNT][SQ_INDEX_COUNT] = {\n"); fprintf(f, "static const Bb64 between_lookup[SQ_COUNT][SQ_COUNT] = {\n");
for (enum square_index i = SQ_INDEX_BEGIN; i < SQ_INDEX_COUNT; ++i) { for (Sq8 i = SQ_BEGIN; i < SQ_COUNT; ++i) {
fprintf(f, "[%s] = {\n", square_index_str[i]); fprintf(f, "[%s] = {\n", sq8_str[i]);
for (enum square_index j = SQ_INDEX_BEGIN; j < SQ_INDEX_COUNT; ++j) { for (Sq8 j = SQ_BEGIN; j < SQ_COUNT; ++j) {
fprintf(f, "0x%016"BITBOARD_FMT_X"ULL, \n", between_lookup[i][j]); fprintf(f, "0x%016"BITBOARD_FMT_X"ULL, \n", between_lookup[i][j]);
} }
fprintf(f, "\n},\n"); fprintf(f, "\n},\n");

591
engine-attack-sets.h Normal file
View File

@@ -0,0 +1,591 @@
#pragma once
#include "engine-types.h"
#include "engine-board.h"
/* `struct magic` is used by magic bitboard lookups, see
* rook_attacks_from_index and bishop_attacks_from_index */
struct magic {
Bb64 mask;
Bb64 magic;
};
static Bb64 cardinals_from_index(Sq8 p)
{
return (FILE_MASK(sq_to_file(p)) | RANK_MASK(sq_to_rank(p)));
}
static Bb64 diagonals_from_index(Sq8 sq)
{
#ifdef CODEGEN
enum rank_index const rank = sq_to_rank(sq);
enum file_index const file = sq_to_file(sq);
Bb64 mask = 0ULL;
_Static_assert(((enum rank_index)-1) > 0, "rank_index must be unsigned");
_Static_assert(((enum file_index)-1) > 0, "file_index must be unsigned");
enum rank_index r;
enum file_index f;
for (r = rank+1, f = file+1;
r <= RANK_INDEX_8 && f <= FILE_INDEX_H;
++r, ++f)
{
mask |= MASK_FROM_RF(r, f);
}
for (r = rank+1, f = file-1;
r <= RANK_INDEX_8 && f <= FILE_INDEX_H;
++r, --f)
{
mask |= MASK_FROM_RF(r, f);
}
for (r = rank-1, f = file+1;
r <= RANK_INDEX_8 && f <= FILE_INDEX_H;
--r, ++f)
{
mask |= MASK_FROM_RF(r, f);
}
for (r = rank-1, f = file-1;
r <= RANK_INDEX_8 && f <= FILE_INDEX_H;
--r, --f)
{
mask |= MASK_FROM_RF(r, f);
}
return mask;
#else
#if ! __has_include("diagonals.h")
#error "compile with -DCODEGEN and run once to generate required header files"
#endif
#include "diagonals.h" /* defines static Bb64 diagonals[SQ_COUNT]; */
return diagonals[sq];
#endif
}
/* PIECE ATTACKS
* ==================
*
* All piece attack functions rely on the caller masking their own pieces.
* e.g. `knight_attacks(knights) & ~our_occupied`
* */
static Bb64 knight_attacks(Bb64 p)
{
Bb64 const l1 = MASK_SHIFT_EAST_1(p /*& ~FILE_MASK_H*/);
Bb64 const l2 = MASK_SHIFT_EAST_2(p /*& ~(FILE_MASK_G | FILE_MASK_H)*/);
Bb64 const r1 = MASK_SHIFT_WEST_1 (p /*& ~FILE_MASK_A*/);
Bb64 const r2 = MASK_SHIFT_WEST_2 (p /*& ~(FILE_MASK_A | FILE_MASK_B)*/);
Bb64 const h1 = l1 | r1;
Bb64 const h2 = l2 | r2;
return MASK_SHIFT_NORTH_2(h1)
| MASK_SHIFT_SOUTH_2(h1)
| MASK_SHIFT_NORTH_1(h2)
| MASK_SHIFT_SOUTH_1(h2);
}
static Bb64 knight_attacks_from_index(Sq8 sq)
{
return knight_attacks(MASK_FROM_SQ(sq));
}
static Bb64 rook_attacks_from_index(Sq8 sq, Bb64 occ)
{
#ifdef CODEGEN
enum rank_index const rank = sq_to_rank(sq);
enum file_index const file = sq_to_file(sq);
Bb64 atk = 0ULL;
/* following loops assuming rank and file types are unsigned, which relies on C23 enums */
_Static_assert(((enum rank_index)-1) > 0, "rank_index must be unsigned");
_Static_assert(((enum file_index)-1) > 0, "file_index must be unsigned");
for (enum rank_index walk_rank = rank+1; walk_rank <= RANK_INDEX_8; ++walk_rank) {
Bb64 const sq = MASK_FROM_RF(walk_rank, file);
atk |= sq;
if (occ & sq) {
break;
}
}
for (enum rank_index walk_rank = rank-1; walk_rank <= RANK_INDEX_8; --walk_rank) {
Bb64 const sq = MASK_FROM_RF(walk_rank, file);
atk |= sq;
if (occ & sq) {
break;
}
}
for (enum file_index walk_file = file+1; walk_file <= FILE_INDEX_H; ++walk_file) {
Bb64 const sq = MASK_FROM_RF(rank, walk_file);
atk |= sq;
if (occ & sq) {
break;
}
}
for (enum file_index walk_file = file-1; walk_file <= FILE_INDEX_H; --walk_file) {
Bb64 const sq = MASK_FROM_RF(rank, walk_file);
atk |= sq;
if (occ & sq) {
break;
}
}
return atk;
#else
#if ! __has_include("mbb_rook.h")
#error "compile with -DCODEGEN and run once to generate required header files"
#else
/* defines
- `mbb_rook[SQ_COUNT]`
- `Bb64 rook_attacks[SQ_COUNT][1<<12ULL] */
#include "mbb_rook.h"
struct magic const m = mbb_rook[sq];
occ &= m.mask;
occ *= m.magic;
occ >>= (64ULL-12ULL);
assuming(rook_attacks[sq][occ] != MASK_FROM_SQ(sq));
return rook_attacks[sq][occ];
#endif
#endif
}
static Bb64 rook_attacks(Bb64 p, Bb64 occ)
{
Bb64 b = 0ULL;
while (p) {
Sq8 const lsb = bitboard_pop_lsb(&p);
b |= rook_attacks_from_index(lsb, occ);
}
return b;
}
static Bb64 bishop_attacks_from_index(Sq8 sq, Bb64 occ)
{
#ifdef CODEGEN
enum rank_index const rank = sq_to_rank(sq);
enum file_index const file = sq_to_file(sq);
Bb64 atk = 0ULL;
/* following loops assuming rank and file types are unsigned, which relies on C23 enums */
_Static_assert(((enum rank_index)-1) > 0, "rank_index must be unsigned");
_Static_assert(((enum file_index)-1) > 0, "file_index must be unsigned");
enum rank_index walk_rank;
enum file_index walk_file;
for (walk_rank = rank+1, walk_file = file+1;
walk_rank <= RANK_INDEX_8 && walk_file <= FILE_INDEX_H;
++walk_rank, ++walk_file) {
Bb64 const sq = MASK_FROM_RF(walk_rank, walk_file);
atk |= sq;
if (occ & sq) {
break;
}
}
for (walk_rank = rank+1, walk_file = file-1;
walk_rank <= RANK_INDEX_8 && walk_file <= FILE_INDEX_H;
++walk_rank, --walk_file) {
Bb64 const sq = MASK_FROM_RF(walk_rank, walk_file);
atk |= sq;
if (occ & sq) {
break;
}
}
for (walk_rank = rank-1, walk_file = file+1;
walk_rank <= RANK_INDEX_8 && walk_file <= FILE_INDEX_H;
--walk_rank, ++walk_file) {
Bb64 const sq = MASK_FROM_RF(walk_rank, walk_file);
atk |= sq;
if (occ & sq) {
break;
}
}
for (walk_rank = rank-1, walk_file = file-1;
walk_rank <= RANK_INDEX_8 && walk_file <= FILE_INDEX_H;
--walk_rank, --walk_file) {
Bb64 const sq = MASK_FROM_RF(walk_rank, walk_file);
atk |= sq;
if (occ & sq) {
break;
}
}
return atk;
#else
#if ! __has_include("mbb_bishop.h")
#error "compile with -DCODEGEN and run once to generate required header files"
#else
/* defines
- `mbb_bishop[SQ_COUNT]`
- `Bb64 bishop_attacks[SQ_COUNT][1<<9ULL] */
#include "mbb_bishop.h"
assuming(sq < SQ_COUNT);
struct magic const m = mbb_bishop[sq];
occ &= m.mask;
occ *= m.magic;
occ >>= (64ULL-9ULL);
return bishop_attacks[sq][occ];
#endif
#endif
}
static Bb64 bishop_attacks(Bb64 p, Bb64 occ)
{
Bb64 b = 0ULL;
while (p) {
Sq8 const lsb = bitboard_pop_lsb(&p);
b |= bishop_attacks_from_index(lsb, occ);
}
return b;
}
static Bb64 queen_attacks_from_index(Sq8 sq, Bb64 occ)
{
return bishop_attacks_from_index(sq, occ) | rook_attacks_from_index(sq, occ);
}
static Bb64 queen_attacks(Bb64 p, Bb64 occ)
{
Bb64 b = 0ULL;
while (p) {
Sq8 const lsb = bitboard_pop_lsb(&p);
b |= queen_attacks_from_index(lsb, occ);
}
return b;
}
#define DEFINE_PAWN_MOVE_FUNCTIONS(identifier, side_enum, direction, starting_rank, next_rank) \
static inline Bb64 pawn_moves_##identifier(Bb64 p, Bb64 empty)\
{\
Bb64 const single_push = MASK_SHIFT_##direction##_1(p) & empty;\
Bb64 const double_push =\
MASK_SHIFT_##direction##_1(single_push & next_rank) & empty;\
return (single_push | double_push);\
}\
\
static inline Bb64 pawn_moves_##identifier##_from_index(Sq8 sq, Bb64 empty)\
{\
return pawn_moves_##identifier(MASK_FROM_SQ(sq), empty);\
}\
\
static inline Bb64 pawn_single_push_##identifier(Bb64 p, Bb64 empty)\
{\
return MASK_SHIFT_##direction##_1(p) & empty;\
}\
\
static inline Bb64 pawn_double_push_##identifier(Bb64 p, Bb64 empty)\
{\
Bb64 const once = MASK_SHIFT_##direction##_1(p) & empty;\
Bb64 const twice = MASK_SHIFT_##direction##_1(once) & empty;\
return twice;\
}\
\
static inline Bb64 pawn_attacks_right_##identifier(Bb64 p)\
{\
Bb64 const up = MASK_SHIFT_##direction##_1(p);\
return MASK_SHIFT_EAST_1(up);\
}\
\
static inline Bb64 pawn_attacks_left_##identifier(Bb64 p)\
{\
Bb64 const up = MASK_SHIFT_##direction##_1(p);\
return MASK_SHIFT_WEST_1(up);\
}\
\
static inline Bb64 pawn_attacks_##identifier(Bb64 p)\
{\
Bb64 const up = MASK_SHIFT_##direction##_1(p);\
Bb64 const captures_right = MASK_SHIFT_EAST_1(up);\
Bb64 const captures_left = MASK_SHIFT_WEST_1(up);\
\
return (captures_right | captures_left);\
}\
\
static inline Bb64 pawn_attacks_##identifier##_from_index(Sq8 sq)\
{\
return pawn_attacks_##identifier(MASK_FROM_SQ(sq));\
}
DEFINE_PAWN_MOVE_FUNCTIONS(white, SIDE_WHITE, NORTH, RANK_MASK_2, RANK_MASK_3)
DEFINE_PAWN_MOVE_FUNCTIONS(black, SIDE_BLACK, SOUTH, RANK_MASK_7, RANK_MASK_6)
/* temporary solution, annoying branch */
static inline Bb64 pawn_moves_dispatch(Bb64 p, Bb64 empty, Side8 attacker)
{
if (attacker == SIDE_WHITE) {
return pawn_moves_white(p, empty);
} else {
return pawn_moves_black(p, empty);
}
}
/* temporary solution, annoying branch */
static inline Bb64 pawn_moves_from_index_dispatch(Sq8 sq, Bb64 empty, Side8 attacker)
{
if (attacker == SIDE_WHITE) {
return pawn_moves_white_from_index(sq, empty);
} else {
return pawn_moves_black_from_index(sq, empty);
}
}
/* temporary solution, annoying branch */
static inline Bb64 pawn_attacks_from_index_dispatch(Sq8 sq, Side8 attacker)
{
if (attacker == SIDE_WHITE) {
return pawn_attacks_white_from_index(sq);
} else {
return pawn_attacks_black_from_index(sq);
}
}
static inline Bb64 pawn_attacks_dispatch(Bb64 b, Side8 attacker)
{
if (attacker == SIDE_WHITE) {
return pawn_attacks_white(b);
} else {
return pawn_attacks_black(b);
}
}
static Bb64 king_attacks(Bb64 sq)
{
/* potential untested improvements:
* - lookup table
* - union of three files, three ranks and ~sq */
Bb64 const n = MASK_SHIFT_NORTH_1(sq);
Bb64 const s = MASK_SHIFT_SOUTH_1(sq);
Bb64 const w = MASK_SHIFT_WEST_1(sq);
Bb64 const e = MASK_SHIFT_EAST_1(sq);
Bb64 const nw = MASK_SHIFT_WEST_1(n);
Bb64 const ne = MASK_SHIFT_EAST_1(n);
Bb64 const sw = MASK_SHIFT_WEST_1(s);
Bb64 const se = MASK_SHIFT_EAST_1(s);
return (n | s | w | e | nw | ne | sw | se);
}
static Bb64 king_attacks_from_index(Sq8 sq)
{
return king_attacks(MASK_FROM_SQ(sq));
}
static Bb64 non_pawn_piece_attacks(Piece8 piece, Bb64 p, Bb64 occ)
{
assuming(piece != PIECE_PAWN);
switch (piece) {
case PIECE_KNIGHT: {
return knight_attacks(p);
} break;
case PIECE_BISHOP: {
return bishop_attacks(p, occ);
} break;
case PIECE_ROOK: {
return rook_attacks(p, occ);
} break;
case PIECE_QUEEN: {
return queen_attacks(p, occ);
} break;
case PIECE_KING: {
return king_attacks(p);
} break;
default: {
assuming(false);
} break;
}
}
static Bb64 non_pawn_piece_attacks_from_index(Piece8 piece, Sq8 sq, Bb64 occ)
{
assuming(piece != PIECE_PAWN);
switch (piece) {
case PIECE_KNIGHT: {
return knight_attacks_from_index(sq);
} break;
case PIECE_BISHOP: {
return bishop_attacks_from_index(sq, occ);
} break;
case PIECE_ROOK: {
return rook_attacks_from_index(sq, occ);
} break;
case PIECE_QUEEN: {
return queen_attacks_from_index(sq, occ);
} break;
case PIECE_KING: {
return king_attacks_from_index(sq);
} break;
default: {
assuming(false);
} break;
}
}
static Bb64 between_mask(Sq8 a, Sq8 b)
{
#ifdef CODEGEN
enum rank_index const ra = sq_to_rank(a);
enum file_index const fa = sq_to_file(a);
enum rank_index const rb = sq_to_rank(b);
enum file_index const fb = sq_to_file(b);
/* directional differences */
int const dr = (int)rb - (int)ra;
int const df = (int)fb - (int)fa;
int step_r = 0;
int step_f = 0;
if (df == 0 && dr != 0) {
step_r = (dr > 0) ? 1 : -1;
step_f = 0;
}
else if (dr == 0 && df != 0) {
step_r = 0;
step_f = (df > 0) ? 1 : -1;
}
else if (dr != 0 && (dr > 0 ? dr : -dr) == (df > 0 ? df : -df)) {
step_r = (dr > 0) ? 1 : -1;
step_f = (df > 0) ? 1 : -1;
}
else {
return 0ULL;
}
Bb64 mask = 0ULL;
enum rank_index r = (enum rank_index)((int)ra + step_r);
enum file_index f = (enum file_index)((int)fa + step_f);
while (r != rb || f != fb) {
mask |= MASK_FROM_RF(r, f);
r = (enum rank_index)((int)r + step_r);
f = (enum file_index)((int)f + step_f);
}
return mask;
#else
#if ! __has_include("between_lookup.h")
#error "compile codegen.c and run once to generate required header files"
#else
/* defines static between_lookup[sq8_COUNT][sq8_COUNT] */
#include "between_lookup.h"
return between_lookup[a][b];
#endif
#endif
}
static Bb64 attacks_to(struct pos const* pos,
Bb64 targets,
Bb64 pretend_occupied,
Bb64 pretend_empty)
{
Bb64 const occ_orig = pos->occupied[SIDE_WHITE] | pos->occupied[SIDE_BLACK];
Bb64 const occ = (occ_orig & ~pretend_empty) | pretend_occupied;
Bb64 const* pw = pos->pieces[SIDE_WHITE];
Bb64 const* pb = pos->pieces[SIDE_BLACK];
Bb64 const wps = pw[PIECE_PAWN];
Bb64 const bps = pb[PIECE_PAWN];
Bb64 const ns = (pw[PIECE_KNIGHT]
| pb[PIECE_KNIGHT])
;
Bb64 const ks = (pw[PIECE_KING]
| pb[PIECE_KING])
;
Bb64 const qs = (pw[PIECE_QUEEN]
| pb[PIECE_QUEEN])
;
Bb64 const qrs = (pw[PIECE_ROOK]
| pb[PIECE_ROOK]
| qs)
;
Bb64 const qbs = (pw[PIECE_BISHOP]
| pb[PIECE_BISHOP]
| qs)
;
return ((bps & pawn_attacks_white(targets))
| (wps & pawn_attacks_black(targets))
| (ns & knight_attacks(targets))
| (qbs & bishop_attacks(targets, occ))
| (qrs & rook_attacks(targets, occ))
| (ks & king_attacks(targets)))
& ~pretend_occupied;
}
static
Bb64 checkers(struct pos const* pos, Side8 us)
{
/* TODO: specialize */
return attacks_to(pos, pos->pieces[us][PIECE_KING], 0ULL, 0ULL) & ~pos->occupied[us];
}
static
Bb64 pinning_lines_to_target(struct pos const* pos, Side8 us, Sq8 tsq)
{
Side8 const them = other_side(us);
Bb64 const our_occ = pos->occupied[us];
Bb64 const their_occ = pos->occupied[them];
Bb64 const* p = pos->pieces[them];
Bb64 const bqs = p[PIECE_QUEEN] | p[PIECE_BISHOP];
Bb64 const rqs = p[PIECE_QUEEN] | p[PIECE_ROOK];
Bb64 pinners = (bqs & bishop_attacks_from_index(tsq, their_occ))
| (rqs & rook_attacks_from_index(tsq, their_occ));
Bb64 pinned = 0;
while (pinners) {
Sq8 const sq = bitboard_pop_lsb(&pinners);
Bb64 const blockers = between_mask(tsq, sq) & our_occ;
if (!bitboard_more_than_one(blockers)) {
pinned |= blockers;
}
}
return pinned;
}
static
Bb64 all_threats_from_side(struct pos const * pos, Side8 who)
{
Bb64 const occ = pos->occupied[SIDE_WHITE] | pos->occupied[SIDE_BLACK];
Bb64 const* p = pos->pieces[who];
Bb64 t = 0ULL;
t |= pawn_attacks_dispatch(p[PIECE_PAWN], who);
t |= knight_attacks(p[PIECE_KNIGHT]);
t |= bishop_attacks(p[PIECE_BISHOP], occ);
t |= rook_attacks(p[PIECE_ROOK], occ);
t |= queen_attacks(p[PIECE_QUEEN], occ);
t |= king_attacks(p[PIECE_KING]);
return t;
}

143
engine-bitboard.h Normal file
View File

@@ -0,0 +1,143 @@
#pragma once
typedef uint64_t Bb64;
#define BITBOARD( \
a8,b8,c8,d8,e8,f8,g8,h8, \
a7,b7,c7,d7,e7,f7,g7,h7, \
a6,b6,c6,d6,e6,f6,g6,h6, \
a5,b5,c5,d5,e5,f5,g5,h5, \
a4,b4,c4,d4,e4,f4,g4,h4, \
a3,b3,c3,d3,e3,f3,g3,h3, \
a2,b2,c2,d2,e2,f2,g2,h2, \
a1,b1,c1,d1,e1,f1,g1,h1) \
(Bb64)\
0b##\
h8##g8##f8##e8##d8##c8##b8##a8##\
h7##g7##f7##e7##d7##c7##b7##a7##\
h6##g6##f6##e6##d6##c6##b6##a6##\
h5##g5##f5##e5##d5##c5##b5##a5##\
h4##g4##f4##e4##d4##c4##b4##a4##\
h3##g3##f3##e3##d3##c3##b3##a3##\
h2##g2##f2##e2##d2##c2##b2##a2##\
h1##g1##f1##e1##d1##c1##b1##a1##\
ULL
#define FILE_MASK(n) MASK_SHIFT_EAST((Bb64)0x0101010101010101ULL, n)
#define RANK_MASK(n) MASK_SHIFT_NORTH((Bb64)0x00000000000000FFULL, n)
#define MASK_FROM_SQ(idx) (((Bb64)1ULL)<<((Index8)idx))
#define MASK_FROM_RF(rank, file) (MASK_FROM_SQ(SQ_FROM_RF(rank,file)))
enum : Bb64 {
FILE_MASK_A = FILE_MASK(FILE_INDEX_A),
FILE_MASK_B = FILE_MASK(FILE_INDEX_B),
FILE_MASK_C = FILE_MASK(FILE_INDEX_C),
FILE_MASK_D = FILE_MASK(FILE_INDEX_D),
FILE_MASK_E = FILE_MASK(FILE_INDEX_E),
FILE_MASK_F = FILE_MASK(FILE_INDEX_F),
FILE_MASK_G = FILE_MASK(FILE_INDEX_G),
FILE_MASK_H = FILE_MASK(FILE_INDEX_H),
RANK_MASK_1 = RANK_MASK(RANK_INDEX_1),
RANK_MASK_2 = RANK_MASK(RANK_INDEX_2),
RANK_MASK_3 = RANK_MASK(RANK_INDEX_3),
RANK_MASK_4 = RANK_MASK(RANK_INDEX_4),
RANK_MASK_5 = RANK_MASK(RANK_INDEX_5),
RANK_MASK_6 = RANK_MASK(RANK_INDEX_6),
RANK_MASK_7 = RANK_MASK(RANK_INDEX_7),
RANK_MASK_8 = RANK_MASK(RANK_INDEX_8),
MASK_SHIFT_EAST_GUARD_0 = ~0ULL,
MASK_SHIFT_EAST_GUARD_1 = ~FILE_MASK_H,
MASK_SHIFT_EAST_GUARD_2 = ~(FILE_MASK_G | FILE_MASK_H),
MASK_SHIFT_EAST_GUARD_3 = ~(FILE_MASK_F | FILE_MASK_G | FILE_MASK_H),
MASK_SHIFT_EAST_GUARD_4 = ~(FILE_MASK_E | FILE_MASK_F | FILE_MASK_G | FILE_MASK_H),
MASK_SHIFT_EAST_GUARD_5 = ~(FILE_MASK_D | FILE_MASK_E | FILE_MASK_F | FILE_MASK_G | FILE_MASK_H),
MASK_SHIFT_EAST_GUARD_6 = ~(FILE_MASK_C | FILE_MASK_D | FILE_MASK_E | FILE_MASK_F | FILE_MASK_G | FILE_MASK_H),
MASK_SHIFT_EAST_GUARD_7 = ~(FILE_MASK_B | FILE_MASK_C | FILE_MASK_D | FILE_MASK_E | FILE_MASK_F | FILE_MASK_G | FILE_MASK_H),
MASK_SHIFT_WEST_GUARD_0 = ~0ULL,
MASK_SHIFT_WEST_GUARD_1 = ~FILE_MASK_A,
MASK_SHIFT_WEST_GUARD_2 = ~(FILE_MASK_A | FILE_MASK_B),
MASK_SHIFT_WEST_GUARD_3 = ~(FILE_MASK_A | FILE_MASK_B | FILE_MASK_C),
MASK_SHIFT_WEST_GUARD_4 = ~(FILE_MASK_A | FILE_MASK_B | FILE_MASK_C | FILE_MASK_D),
MASK_SHIFT_WEST_GUARD_5 = ~(FILE_MASK_A | FILE_MASK_B | FILE_MASK_C | FILE_MASK_D | FILE_MASK_E),
MASK_SHIFT_WEST_GUARD_6 = ~(FILE_MASK_A | FILE_MASK_B | FILE_MASK_C | FILE_MASK_D | FILE_MASK_E | FILE_MASK_F),
MASK_SHIFT_WEST_GUARD_7 = ~(FILE_MASK_A | FILE_MASK_B | FILE_MASK_C | FILE_MASK_D | FILE_MASK_E | FILE_MASK_F | FILE_MASK_G),
};
#define _MASK_SHIFT_EAST_GUARDED(b, n) \
(((Bb64)(b) & MASK_SHIFT_EAST_GUARD_##n) << (Index8)(n))
#define _MASK_SHIFT_WEST_GUARDED(b, n) \
(((Bb64)(b) & MASK_SHIFT_WEST_GUARD_##n) >> (Index8)(n))
/* MASK_SHIFT_EAST_n shifts the bitboard right by n ranks without wrapping */
#define MASK_SHIFT_EAST_1(b) _MASK_SHIFT_EAST_GUARDED(b, 1)
#define MASK_SHIFT_EAST_2(b) _MASK_SHIFT_EAST_GUARDED(b, 2)
#define MASK_SHIFT_EAST_3(b) _MASK_SHIFT_EAST_GUARDED(b, 3)
#define MASK_SHIFT_EAST_4(b) _MASK_SHIFT_EAST_GUARDED(b, 4)
#define MASK_SHIFT_EAST_5(b) _MASK_SHIFT_EAST_GUARDED(b, 5)
#define MASK_SHIFT_EAST_6(b) _MASK_SHIFT_EAST_GUARDED(b, 6)
#define MASK_SHIFT_EAST_7(b) _MASK_SHIFT_EAST_GUARDED(b, 7)
#define MASK_SHIFT_EAST_8(b) _MASK_SHIFT_EAST_GUARDED(b, 8)
/* MASK_SHIFT_WEST_n shifts the bitboard left by n ranks without wrapping */
#define MASK_SHIFT_WEST_1(b) _MASK_SHIFT_WEST_GUARDED(b, 1)
#define MASK_SHIFT_WEST_2(b) _MASK_SHIFT_WEST_GUARDED(b, 2)
#define MASK_SHIFT_WEST_3(b) _MASK_SHIFT_WEST_GUARDED(b, 3)
#define MASK_SHIFT_WEST_4(b) _MASK_SHIFT_WEST_GUARDED(b, 4)
#define MASK_SHIFT_WEST_5(b) _MASK_SHIFT_WEST_GUARDED(b, 5)
#define MASK_SHIFT_WEST_6(b) _MASK_SHIFT_WEST_GUARDED(b, 6)
#define MASK_SHIFT_WEST_7(b) _MASK_SHIFT_WEST_GUARDED(b, 7)
#define MASK_SHIFT_WEST_8(b) _MASK_SHIFT_WEST_GUARDED(b, 8)
/* MASK_SHIFT_NORTH_n shifts the bitboard towards rank 8 by n ranks without wrapping */
#define MASK_SHIFT_NORTH_1(b) MASK_SHIFT_NORTH(b, 1)
#define MASK_SHIFT_NORTH_2(b) MASK_SHIFT_NORTH(b, 2)
#define MASK_SHIFT_NORTH_3(b) MASK_SHIFT_NORTH(b, 3)
#define MASK_SHIFT_NORTH_4(b) MASK_SHIFT_NORTH(b, 4)
#define MASK_SHIFT_NORTH_5(b) MASK_SHIFT_NORTH(b, 5)
#define MASK_SHIFT_NORTH_6(b) MASK_SHIFT_NORTH(b, 6)
#define MASK_SHIFT_NORTH_7(b) MASK_SHIFT_NORTH(b, 7)
#define MASK_SHIFT_NORTH_8(b) MASK_SHIFT_NORTH(b, 8)
/* MASK_SHIFT_SOUTH_n shifts the bitboard towards rank 1 by n ranks without wrapping */
#define MASK_SHIFT_SOUTH_1(b) MASK_SHIFT_SOUTH(b, 1)
#define MASK_SHIFT_SOUTH_2(b) MASK_SHIFT_SOUTH(b, 2)
#define MASK_SHIFT_SOUTH_3(b) MASK_SHIFT_SOUTH(b, 3)
#define MASK_SHIFT_SOUTH_4(b) MASK_SHIFT_SOUTH(b, 4)
#define MASK_SHIFT_SOUTH_5(b) MASK_SHIFT_SOUTH(b, 5)
#define MASK_SHIFT_SOUTH_6(b) MASK_SHIFT_SOUTH(b, 6)
#define MASK_SHIFT_SOUTH_7(b) MASK_SHIFT_SOUTH(b, 7)
#define MASK_SHIFT_SOUTH_8(b) MASK_SHIFT_SOUTH(b, 8)
enum {
#define X(file, rank) SQMASK_##file##rank = MASK_FROM_RF(RANK_INDEX_##rank, FILE_INDEX_##file),
SQUARES_LIST
#undef X
};
static Sq8 bitboard_lsb(Bb64 p)
{
assuming(p != 0);
return (Sq8)__builtin_ffsll((int64_t)p) - 1;
}
static Sq8 bitboard_pop_lsb(Bb64* p)
{
Sq8 const lsb = bitboard_lsb(*p);
*p &= ~(1ULL<<(lsb));
return lsb;
}
static inline uint64_t bitboard_popcount(Bb64 b)
{
return (uint64_t)__builtin_popcountll(b);
}
static inline bool bitboard_more_than_one(Bb64 b)
{
return b & (b - 1);
}

423
engine-board.h Normal file
View File

@@ -0,0 +1,423 @@
#pragma once
#include "engine-types.h"
#include "engine-tt.h"
#include <stddef.h>
#include <stdint.h>
struct board {
struct pos {
Bb64 pieces[SIDE_COUNT][PIECE_COUNT];
Side8 moving_side;
bool castling_illegal[SIDE_COUNT][CASTLE_COUNT];
Bb64 ep_targets;
Bb64 occupied[SIDE_COUNT];
int halfmoves; /* FIXME: this duplicates the hist.length value */
int fullmoves;
uint64_t hash;
} pos;
struct tt tt;
/* used for repeated board state detection only */
struct history {
struct pos items[64];
size_t length;
} hist;
/* Used only for square->piece lookups, not central to logic. Does not
* store which side owns the square piece, and checking non-occupied
* squares is undefined
*
* TODO: make mailbox smaller, only 3 bits are needed per piece
* */
Piece8 mailbox[SQ_COUNT];
};
#define BOARD_INIT (struct board) { \
.pos = { \
.fullmoves = 1, \
.pieces = { \
[SIDE_WHITE] = { \
[PIECE_PAWN] = RANK_MASK_2, \
[PIECE_ROOK] = SQMASK_A1 | SQMASK_H1, \
[PIECE_KNIGHT] = SQMASK_B1 | SQMASK_G1, \
[PIECE_BISHOP] = SQMASK_C1 | SQMASK_F1, \
[PIECE_QUEEN] = SQMASK_D1, \
[PIECE_KING] = SQMASK_E1, \
}, \
[SIDE_BLACK] = { \
[PIECE_PAWN] = RANK_MASK_7, \
[PIECE_ROOK] = SQMASK_A8 | SQMASK_H8, \
[PIECE_KNIGHT] = SQMASK_B8 | SQMASK_G8, \
[PIECE_BISHOP] = SQMASK_C8 | SQMASK_F8, \
[PIECE_QUEEN] = SQMASK_D8, \
[PIECE_KING] = SQMASK_E8, \
} \
}, \
.occupied = { \
[SIDE_WHITE] = \
RANK_MASK_2 | SQMASK_A1 | SQMASK_H1 | \
SQMASK_B1 | SQMASK_G1 | SQMASK_C1 | \
SQMASK_F1 | SQMASK_D1 | SQMASK_E1, \
[SIDE_BLACK] = \
RANK_MASK_7 | SQMASK_A8 | SQMASK_H8 | \
SQMASK_B8 | SQMASK_G8| SQMASK_C8 | \
SQMASK_F8| SQMASK_D8| SQMASK_E8, \
}, \
.hash = ~0ULL, \
}, \
.mailbox = { \
[SQ_A1] = PIECE_ROOK, \
[SQ_B1] = PIECE_KNIGHT, \
[SQ_C1] = PIECE_BISHOP, \
[SQ_D1] = PIECE_QUEEN, \
[SQ_E1] = PIECE_KING, \
[SQ_F1] = PIECE_BISHOP, \
[SQ_G1] = PIECE_KNIGHT, \
[SQ_H1] = PIECE_ROOK, \
[SQ_A2] = PIECE_PAWN, \
[SQ_B2] = PIECE_PAWN, \
[SQ_C2] = PIECE_PAWN, \
[SQ_D2] = PIECE_PAWN, \
[SQ_E2] = PIECE_PAWN, \
[SQ_F2] = PIECE_PAWN, \
[SQ_G2] = PIECE_PAWN, \
[SQ_H2] = PIECE_PAWN, \
[SQ_A7] = PIECE_PAWN, \
[SQ_B7] = PIECE_PAWN, \
[SQ_C7] = PIECE_PAWN, \
[SQ_D7] = PIECE_PAWN, \
[SQ_E7] = PIECE_PAWN, \
[SQ_F7] = PIECE_PAWN, \
[SQ_G7] = PIECE_PAWN, \
[SQ_H7] = PIECE_PAWN, \
[SQ_A8] = PIECE_ROOK, \
[SQ_B8] = PIECE_KNIGHT, \
[SQ_C8] = PIECE_BISHOP, \
[SQ_D8] = PIECE_QUEEN, \
[SQ_E8] = PIECE_KING, \
[SQ_F8] = PIECE_BISHOP, \
[SQ_G8] = PIECE_KNIGHT, \
[SQ_H8] = PIECE_ROOK, \
}, \
.hist = {0}, \
}
void board_init(struct board* b)
{
if (b->pos.fullmoves == 0 && b->pos.hash == 0) {
*b = BOARD_INIT;
}
if (b->tt.entries == NULL) {
b->tt.entries = sys_mmap_anon_shared(TT_ENTRIES * sizeof b->tt.entries[0],
SYS_PROT_READ | SYS_PROT_WRITE,
SYS_MADV_RANDOM);
if (b->tt.entries == NULL) {
__builtin_trap();
}
}
}
static bool board_load_fen_unsafe(struct board* b, char const* fen_str)
{
/* TODO: this function is not tested for malicious/corrupted inputs */
struct {
char const* buf;
size_t i;
size_t len;
} fen = {
.buf = fen_str,
.i = 0,
.len = strlen(fen_str),
};
#define BUF_GETCHAR(x) (assuming(x.i < x.len), x.buf[x.i++])
my_memset(&b->pos, 0, sizeof b->pos);
b->pos.hash = ~0ULL;
for (enum rank_index ri = RANK_INDEX_8; ri < RANK_INDEX_COUNT; --ri) {
for (enum file_index fi = FILE_INDEX_BEGIN; fi < FILE_INDEX_COUNT; ++fi) {
char const ch = BUF_GETCHAR(fen);
if (my_isdigit(ch)) {
if (ch == '0') {
__builtin_trap();
}
fi += ch - '0' - 1;
} else {
struct piece_side const p = piece_and_side_from_char[(uint8_t)ch];
Bb64 const sq_mask = MASK_FROM_RF(ri, fi);
b->pos.pieces[p.side][p.piece] |= sq_mask;
b->pos.occupied[p.side] |= sq_mask;
b->mailbox[SQ_FROM_RF(ri, fi)] = p.piece;
}
}
(void)BUF_GETCHAR(fen); /* discard '/' or ' ' */
}
{ /* active color */
char const ch = BUF_GETCHAR(fen);
if (ch == 'w') {
b->pos.moving_side = SIDE_WHITE;
} else if (ch == 'b') {
b->pos.moving_side = SIDE_BLACK;
} else {
__builtin_trap();
}
}
{ /* castling */
char ch = BUF_GETCHAR(fen);
if (ch != ' ') {
__builtin_trap();
}
b->pos.castling_illegal[SIDE_WHITE][CASTLE_KINGSIDE] = true;
b->pos.castling_illegal[SIDE_WHITE][CASTLE_QUEENSIDE] = true;
b->pos.castling_illegal[SIDE_BLACK][CASTLE_KINGSIDE] = true;
b->pos.castling_illegal[SIDE_BLACK][CASTLE_QUEENSIDE] = true;
do {
ch = BUF_GETCHAR(fen);
switch (ch) {
case 'K': b->pos.castling_illegal[SIDE_WHITE][CASTLE_KINGSIDE] = false; break;
case 'Q': b->pos.castling_illegal[SIDE_WHITE][CASTLE_QUEENSIDE] = false; break;
case 'k': b->pos.castling_illegal[SIDE_BLACK][CASTLE_KINGSIDE] = false; break;
case 'q': b->pos.castling_illegal[SIDE_BLACK][CASTLE_QUEENSIDE] = false; break;
case ' ': break;
case '-': break;
default: {
__builtin_trap();
} break;
}
} while (ch != ' ');
}
{ /* en passent */
char const ch = BUF_GETCHAR(fen);
if (ch != '-') {
__builtin_trap();
}
}
{ /* halfmoves */
b->pos.halfmoves = 0;
char ch = BUF_GETCHAR(fen);
while (ch != ' ') {
b->pos.halfmoves *= 10;
b->pos.halfmoves += ch-'0';
ch = BUF_GETCHAR(fen);
}
}
{ /* fullmoves */
b->pos.fullmoves = 0;
char ch = BUF_GETCHAR(fen);
while (ch != ' ') {
b->pos.fullmoves *= 10;
b->pos.fullmoves += ch-'0';
ch = BUF_GETCHAR(fen);
}
}
#undef BUF_GETCHAR
return true;
}
enum move_result {
MR_NORMAL,
MR_CHECK,
MR_REPEATS, /* means this board state has been observed before */
MR_STALEMATE,
MR_CHECKMATE,
};
/* does not check validity */
static enum move_result move_piece(struct pos* restrict pos,
struct history* restrict hist,
Piece8 mailbox[restrict static SQ_COUNT],
struct move move)
{
Side8 const us = pos->moving_side;
Side8 const them = other_side(us);
Piece8 const from_piece = mailbox[move.from];
Piece8 const to_piece = mailbox[move.to];
Bb64 const from_mask = MASK_FROM_SQ(move.from);
Bb64 const to_mask = MASK_FROM_SQ(move.to);
Sq8 const krook = (us == SIDE_WHITE) ? SQ_H1 : SQ_H8;
Sq8 const qrook = (us == SIDE_WHITE) ? SQ_A1 : SQ_A8;
Sq8 const krook_to = (us == SIDE_WHITE) ? SQ_F1 : SQ_F8;
Sq8 const qrook_to = (us == SIDE_WHITE) ? SQ_D1 : SQ_D8;
Sq8 const ksq = (us == SIDE_WHITE) ? SQ_E1 : SQ_E8;
Sq8 const kcast_sq = (us == SIDE_WHITE) ? SQ_G1 : SQ_G8;
Sq8 const qcast_sq = (us == SIDE_WHITE) ? SQ_C1 : SQ_C8;
Sq8 const their_krook = (us != SIDE_WHITE) ? SQ_H1 : SQ_H8;
Sq8 const their_qrook = (us != SIDE_WHITE) ? SQ_A1 : SQ_A8;
#define POS_MOVE(side, piece, from, to) \
do { \
Bb64 const x = MASK_FROM_SQ(from) | MASK_FROM_SQ(to); \
pos->pieces[side][piece] ^= x; \
pos->occupied[side] ^= x; \
pos->hash = tt_hash_update(pos->hash, from, side, piece); \
pos->hash = tt_hash_update(pos->hash, to, side, piece); \
mailbox[to] = piece; \
if (piece == PIECE_PAWN) pos->halfmoves = 0; \
} while (0)
#define POS_REMOVE(owner, piece, at) \
do { \
Bb64 const x = MASK_FROM_SQ(at); \
pos->pieces[owner][piece] &= ~x; \
pos->occupied[owner] &= ~x; \
pos->hash = tt_hash_update(pos->hash, at, owner, piece); \
hist->length = 0; \
pos->halfmoves = 0; \
} while (0)
#define POS_ADD(owner, piece, at) \
do { \
Bb64 const x = MASK_FROM_SQ(at); \
pos->pieces[owner][piece] |= x; \
pos->occupied[owner] |= x; \
pos->hash = tt_hash_update(pos->hash, at, owner, piece); \
mailbox[at] = piece; \
pos->halfmoves = 0; \
hist->length = 0; \
} while (0)
Bb64 const ep_targets_now = pos->ep_targets;
if (ep_targets_now) {
pos->hash = tt_hash_update_ep_targets(pos->hash, bitboard_lsb(ep_targets_now));
}
pos->ep_targets = 0ULL;
/* castle kingside, legality is checked by the caller */
/**/ if (from_piece == PIECE_KING && move.from == ksq && move.to == kcast_sq) {
POS_MOVE(us, PIECE_KING, ksq, kcast_sq);
POS_MOVE(us, PIECE_ROOK, krook, krook_to);
}
/* castle queenside, legality is checked by the caller */
else if (from_piece == PIECE_KING && move.from == ksq && move.to == qcast_sq) {
POS_MOVE(us, PIECE_KING, ksq, qcast_sq);
POS_MOVE(us, PIECE_ROOK, qrook, qrook_to);
}
/* regular move / capture */
else {
POS_MOVE(us, from_piece, move.from, move.to);
/* capture */
if (to_mask & pos->occupied[them]) {
POS_REMOVE(them, to_piece, move.to);
}
/* promote / ep */
if (from_piece == PIECE_PAWN) {
Bb64 const finishline = (us == SIDE_WHITE ? RANK_MASK_8 : RANK_MASK_1);
/* en passent */
/**/ if (to_mask & ep_targets_now) {
Sq8 const ti =
(us == SIDE_WHITE)
? SQ_SHIFT_SOUTH(move.to, 1)
: SQ_SHIFT_NORTH(move.to, 1);
POS_REMOVE(them, PIECE_PAWN, ti);
}
/* pawn double push -> new ep_target */
else if (us == SIDE_WHITE && (from_mask & RANK_MASK_2) && (to_mask & RANK_MASK_4)) {
pos->ep_targets |= MASK_SHIFT_NORTH_1(from_mask);
pos->hash = tt_hash_update_ep_targets(pos->hash, SQ_SHIFT_NORTH(move.from, 1));
}
else if (us == SIDE_BLACK && (from_mask & RANK_MASK_7) && (to_mask & RANK_MASK_5)) {
pos->ep_targets |= MASK_SHIFT_SOUTH_1(from_mask);
pos->hash = tt_hash_update_ep_targets(pos->hash, SQ_SHIFT_SOUTH(move.from, 1));
}
/* promote */
else if (to_mask & finishline) {
/* already moved to `move.to` */
POS_REMOVE(us, PIECE_PAWN, move.to);
POS_ADD(us, PIECE_QUEEN, move.to);
}
}
}
/* castling rights */
if (!pos->castling_illegal[us][CASTLE_KINGSIDE]) {
if (move.from == ksq || move.from == krook) {
pos->castling_illegal[us][CASTLE_KINGSIDE] = true;
pos->hash = tt_hash_update_castling_rights(pos->hash, us, CASTLE_KINGSIDE);
}
}
if (!pos->castling_illegal[us][CASTLE_QUEENSIDE]) {
if (move.from == ksq || move.from == qrook) {
pos->castling_illegal[us][CASTLE_QUEENSIDE] = true;
pos->hash = tt_hash_update_castling_rights(pos->hash, us, CASTLE_QUEENSIDE);
}
}
if (move.to == their_krook) {
if (!pos->castling_illegal[them][CASTLE_KINGSIDE]) {
pos->castling_illegal[them][CASTLE_KINGSIDE] = true;
pos->hash = tt_hash_update_castling_rights(pos->hash, them, CASTLE_KINGSIDE);
}
}
if (move.to == their_qrook) {
if (!pos->castling_illegal[them][CASTLE_QUEENSIDE]) {
pos->castling_illegal[them][CASTLE_QUEENSIDE] = true;
pos->hash = tt_hash_update_castling_rights(pos->hash, them, CASTLE_QUEENSIDE);
}
}
pos->hash = tt_hash_switch_side(pos->hash);
pos->moving_side = them;
pos->fullmoves += (pos->moving_side == SIDE_BLACK);
pos->halfmoves += 1;
assuming(hist->length < 64);
int repetitions = 0;
for (size_t i = 0; i < hist->length; ++i) {
_Static_assert(sizeof *pos == sizeof hist->items[i]);
if (!my_memcmp(&hist->items[i].pieces, &pos->pieces, sizeof pos->pieces)
&& !my_memcmp(&hist->items[i].castling_illegal, &pos->castling_illegal, sizeof pos->castling_illegal)
&& hist->items[i].moving_side == pos->moving_side
&& hist->items[i].ep_targets == pos->ep_targets)
{
repetitions += 1;
}
}
hist->items[hist->length++] = *pos;
if (repetitions >= 3 || pos->halfmoves > 50) {
return MR_STALEMATE;
}
else if (repetitions > 0) {
return MR_REPEATS;
}
else if (pos->halfmoves > 50) {
return MR_STALEMATE;
}
#if 0
else if (attacks_to(pos, pos->pieces[them][PIECE_KING], 0ULL, 0ULL)
& ~pos->occupied[them]) {
return MR_CHECK;
}
#endif
else {
return MR_NORMAL;
}
#undef POS_MOVE
#undef POS_ADD
#undef POS_REMOVE
}
static enum move_result board_move(struct board* b, struct move move)
{
return move_piece(&b->pos,
&b->hist,
b->mailbox,
move);
}

124
evaluations.h → engine-evaluations.h
View File

@@ -29,7 +29,7 @@ static enum game_progress endgameness(struct pos const* pos)
}; };
int npm = 0; /* non-pawn material */ int npm = 0; /* non-pawn material */
for (enum player pl = PLAYER_BEGIN; pl < PLAYER_COUNT; ++pl) { for (Side8 pl = SIDE_BEGIN; pl < SIDE_COUNT; ++pl) {
npm += piece_value[PIECE_QUEEN] * bitboard_popcount(pos->pieces[pl][PIECE_QUEEN]); npm += piece_value[PIECE_QUEEN] * bitboard_popcount(pos->pieces[pl][PIECE_QUEEN]);
npm += piece_value[PIECE_BISHOP] * bitboard_popcount(pos->pieces[pl][PIECE_BISHOP]); npm += piece_value[PIECE_BISHOP] * bitboard_popcount(pos->pieces[pl][PIECE_BISHOP]);
npm += piece_value[PIECE_KNIGHT] * bitboard_popcount(pos->pieces[pl][PIECE_KNIGHT]); npm += piece_value[PIECE_KNIGHT] * bitboard_popcount(pos->pieces[pl][PIECE_KNIGHT]);
@@ -39,7 +39,7 @@ static enum game_progress endgameness(struct pos const* pos)
/**/ if (npm > 24) { /**/ if (npm > 24) {
return GP_OPENING; return GP_OPENING;
} }
else if (npm > 14) { else if (npm > 16) {
return GP_MIDDLE; return GP_MIDDLE;
} }
else { else {
@@ -47,7 +47,6 @@ static enum game_progress endgameness(struct pos const* pos)
} }
} }
#define BITBOARD_WHITE( \ #define BITBOARD_WHITE( \
a8,b8,c8,d8,e8,f8,g8,h8, \ a8,b8,c8,d8,e8,f8,g8,h8, \
a7,b7,c7,d7,e7,f7,g7,h7, \ a7,b7,c7,d7,e7,f7,g7,h7, \
@@ -57,17 +56,15 @@ static enum game_progress endgameness(struct pos const* pos)
a3,b3,c3,d3,e3,f3,g3,h3, \ a3,b3,c3,d3,e3,f3,g3,h3, \
a2,b2,c2,d2,e2,f2,g2,h2, \ a2,b2,c2,d2,e2,f2,g2,h2, \
a1,b1,c1,d1,e1,f1,g1,h1) \ a1,b1,c1,d1,e1,f1,g1,h1) \
(bitboard)\ BITBOARD( \
0b##\ a8,b8,c8,d8,e8,f8,g8,h8, \
h8##g8##f8##e8##d8##c8##b8##a8##\ a7,b7,c7,d7,e7,f7,g7,h7, \
h7##g7##f7##e7##d7##c7##b7##a7##\ a6,b6,c6,d6,e6,f6,g6,h6, \
h6##g6##f6##e6##d6##c6##b6##a6##\ a5,b5,c5,d5,e5,f5,g5,h5, \
h5##g5##f5##e5##d5##c5##b5##a5##\ a4,b4,c4,d4,e4,f4,g4,h4, \
h4##g4##f4##e4##d4##c4##b4##a4##\ a3,b3,c3,d3,e3,f3,g3,h3, \
h3##g3##f3##e3##d3##c3##b3##a3##\ a2,b2,c2,d2,e2,f2,g2,h2, \
h2##g2##f2##e2##d2##c2##b2##a2##\ a1,b1,c1,d1,e1,f1,g1,h1)
h1##g1##f1##e1##d1##c1##b1##a1##\
ULL
#define BITBOARD_BLACK( \ #define BITBOARD_BLACK( \
a8,b8,c8,d8,e8,f8,g8,h8, \ a8,b8,c8,d8,e8,f8,g8,h8, \
@@ -78,17 +75,15 @@ ULL
a3,b3,c3,d3,e3,f3,g3,h3, \ a3,b3,c3,d3,e3,f3,g3,h3, \
a2,b2,c2,d2,e2,f2,g2,h2, \ a2,b2,c2,d2,e2,f2,g2,h2, \
a1,b1,c1,d1,e1,f1,g1,h1) \ a1,b1,c1,d1,e1,f1,g1,h1) \
(bitboard)\ BITBOARD( \
0b##\ a1,b1,c1,d1,e1,f1,g1,h1, \
h1##g1##f1##e1##d1##c1##b1##a1##\ a2,b2,c2,d2,e2,f2,g2,h2, \
h2##g2##f2##e2##d2##c2##b2##a2##\ a3,b3,c3,d3,e3,f3,g3,h3, \
h3##g3##f3##e3##d3##c3##b3##a3##\ a4,b4,c4,d4,e4,f4,g4,h4, \
h4##g4##f4##e4##d4##c4##b4##a4##\ a5,b5,c5,d5,e5,f5,g5,h5, \
h5##g5##f5##e5##d5##c5##b5##a5##\ a6,b6,c6,d6,e6,f6,g6,h6, \
h6##g6##f6##e6##d6##c6##b6##a6##\ a7,b7,c7,d7,e7,f7,g7,h7, \
h7##g7##f7##e7##d7##c7##b7##a7##\ a8,b8,c8,d8,e8,f8,g8,h8)
h8##g8##f8##e8##d8##c8##b8##a8##\
ULL
#define REL_RANK_1 \ #define REL_RANK_1 \
REL_BITBOARD( \ REL_BITBOARD( \
@@ -179,8 +174,8 @@ ULL
0,0,0,0,0,0,0,0) 0,0,0,0,0,0,0,0)
#define REL_DIAGONAL_A1_H8 \ #define DIAGONAL_A1_H8 \
REL_BITBOARD( \ BITBOARD( \
0,0,0,0,0,0,0,1, \ 0,0,0,0,0,0,0,1, \
0,0,0,0,0,0,1,0, \ 0,0,0,0,0,0,1,0, \
0,0,0,0,0,1,0,0, \ 0,0,0,0,0,1,0,0, \
@@ -190,8 +185,8 @@ ULL
0,1,0,0,0,0,0,0, \ 0,1,0,0,0,0,0,0, \
1,0,0,0,0,0,0,0) 1,0,0,0,0,0,0,0)
#define REL_DIAGONAL_A8_H1 \ #define DIAGONAL_A8_H1 \
REL_BITBOARD( \ BITBOARD( \
1,0,0,0,0,0,0,0, \ 1,0,0,0,0,0,0,0, \
0,1,0,0,0,0,0,0, \ 0,1,0,0,0,0,0,0, \
0,0,1,0,0,0,0,0, \ 0,0,1,0,0,0,0,0, \
@@ -261,12 +256,46 @@ ULL
0,0,0,0,0,0,0,0, \ 0,0,0,0,0,0,0,0, \
0,0,0,0,0,0,0,0, \ 0,0,0,0,0,0,0,0, \
1,0,0,0,0,0,0,0, \ 1,0,0,0,0,0,0,0, \
1,0,0,1,1,0,0,0, \
1,1,1,1,1,0,0,0, \ 1,1,1,1,1,0,0,0, \
1,1,1,1,1,0,0,1, \ 1,1,1,1,1,0,0,0, \
1,1,1,1,1,0,0,0, \
1,1,1,1,1,1,1,1, \ 1,1,1,1,1,1,1,1, \
0,0,0,0,0,0,0,0) 0,0,0,0,0,0,0,0)
#define REL_PAWN_KINGSIDE \
REL_BITBOARD( \
0,0,0,0,0,0,0,0, \
0,0,0,0,0,0,0,0, \
0,0,0,0,0,0,0,0, \
0,0,0,0,0,0,0,0, \
0,0,0,0,0,0,0,0, \
0,0,0,0,0,0,0,1, \
0,0,0,0,0,1,1,0, \
0,0,0,0,0,0,0,0)
#define REL_UNDEVELOPED_BISHOPS \
REL_BITBOARD( \
0,0,0,0,0,0,0,0, \
0,0,0,0,0,0,0,0, \
0,0,0,0,0,0,0,0, \
0,0,0,0,0,0,0,0, \
0,0,0,0,0,0,0,0, \
0,0,0,0,0,0,0,0, \
0,0,0,0,0,0,0,0, \
0,0,1,0,0,1,0,0)
#define REL_UNDEVELOPED_KNIGHTS \
REL_BITBOARD( \
0,0,0,0,0,0,0,0, \
0,0,0,0,0,0,0,0, \
0,0,0,0,0,0,0,0, \
0,0,0,0,0,0,0,0, \
0,0,0,0,0,0,0,0, \
0,0,0,0,0,0,0,0, \
0,0,0,0,0,0,0,0, \
0,1,0,0,0,0,1,0)
#define BOARD_CENTER_6X6 \ #define BOARD_CENTER_6X6 \
((FILE_MASK_B | FILE_MASK_C | FILE_MASK_D | FILE_MASK_E | FILE_MASK_F | FILE_MASK_G) \ ((FILE_MASK_B | FILE_MASK_C | FILE_MASK_D | FILE_MASK_E | FILE_MASK_F | FILE_MASK_G) \
& (RANK_MASK_2 | RANK_MASK_3 | RANK_MASK_4 | RANK_MASK_5 | RANK_MASK_6 | RANK_MASK_7)) & (RANK_MASK_2 | RANK_MASK_3 | RANK_MASK_4 | RANK_MASK_5 | RANK_MASK_6 | RANK_MASK_7))
@@ -287,9 +316,10 @@ ULL
/* piece bonus area*/ \ /* piece bonus area*/ \
X(PIECE_PAWN, 0.02, BOARD_CENTER_4X4) \ X(PIECE_PAWN, 0.02, BOARD_CENTER_4X4) \
X(PIECE_KNIGHT, 0.05, BOARD_CENTER_4X4) \ X(PIECE_KNIGHT, 0.05, BOARD_CENTER_4X4) \
X(PIECE_BISHOP, 0.05, REL_DIAGONAL_A1_H8 | REL_DIAGONAL_A8_H1) \ X(PIECE_BISHOP, 0.05, BOARD_CENTER_6X6 & (DIAGONAL_A1_H8 | DIAGONAL_A8_H1)) \
X(PIECE_KING, 0.15, REL_KING_CASTLE_KINGSIDE) \ X(PIECE_KING, 0.15, REL_KING_CASTLE_KINGSIDE) \
X(PIECE_QUEEN, -0.10, RANK_MASK_3 | RANK_MASK_4 | RANK_MASK_5 | RANK_MASK_6) \ X(PIECE_QUEEN, -0.15, RANK_MASK_3 | RANK_MASK_4 | RANK_MASK_5 | RANK_MASK_6) \
X(PIECE_ROOK, 0.10, FILE_MASK_D | FILE_MASK_E) \
/**/ /**/
#define EARLY_POSITIONAL_BONUS_1 \ #define EARLY_POSITIONAL_BONUS_1 \
@@ -300,13 +330,14 @@ ULL
#define EARLY_POSITIONAL_BONUS_2 \ #define EARLY_POSITIONAL_BONUS_2 \
/* piece bonus area*/ \ /* piece bonus area*/ \
X(PIECE_PAWN, -0.10, ~REL_EARLY_PAWN_STRUCTURE) \ X(PIECE_PAWN, -0.18, ~REL_EARLY_PAWN_STRUCTURE) \
X(PIECE_BISHOP, 0.05, CORNERS) \ X(PIECE_KNIGHT, -0.10, REL_UNDEVELOPED_KNIGHTS) \
X(PIECE_BISHOP, -0.10, REL_UNDEVELOPED_BISHOPS) \
/**/ /**/
#define EARLY_POSITIONAL_BONUS_3 \ #define EARLY_POSITIONAL_BONUS_3 \
/* piece bonus area*/ \ /* piece bonus area*/ \
X(PIECE_BISHOP, 0.02, REL_BISHOP_QUEEN_ATTACK) /**/
/* ------------------------------ middle game ------------------------------ */ /* ------------------------------ middle game ------------------------------ */
@@ -316,25 +347,26 @@ ULL
/* piece bonus area*/ \ /* piece bonus area*/ \
X(PIECE_PAWN, 0.02, BOARD_CENTER_4X4) \ X(PIECE_PAWN, 0.02, BOARD_CENTER_4X4) \
X(PIECE_KNIGHT, 0.05, BOARD_CENTER_4X4) \ X(PIECE_KNIGHT, 0.05, BOARD_CENTER_4X4) \
X(PIECE_BISHOP, 0.05, REL_DIAGONAL_A1_H8 | REL_DIAGONAL_A8_H1) \ X(PIECE_BISHOP, 0.05, BOARD_CENTER_6X6 & (DIAGONAL_A1_H8 | DIAGONAL_A8_H1)) \
X(PIECE_KING, 0.15, REL_KING_CASTLE_KINGSIDE) \ X(PIECE_KING, 0.15, REL_KING_CASTLE_KINGSIDE) \
/**/ /**/
#define MIDDLE_POSITIONAL_BONUS_1 \ #define MIDDLE_POSITIONAL_BONUS_1 \
/* piece bonus area*/ \ /* piece bonus area*/ \
X(PIECE_PAWN, 0.02, BOARD_CENTER_2X2) \ X(PIECE_PAWN, 0.02, BOARD_CENTER_2X2) \
X(PIECE_BISHOP, 0.05, REL_BISHOP_KING_ATTACK) \ X(PIECE_BISHOP, 0.07, REL_BISHOP_KING_ATTACK) \
X(PIECE_QUEEN, 0.07, REL_BISHOP_KING_ATTACK) \
/**/ /**/
#define MIDDLE_POSITIONAL_BONUS_2 \ #define MIDDLE_POSITIONAL_BONUS_2 \
/* piece bonus area*/ \ /* piece bonus area*/ \
X(PIECE_PAWN, -0.10, ~REL_EARLY_PAWN_STRUCTURE) \ X(PIECE_PAWN, 0.02, REL_PAWN_KINGSIDE) \
X(PIECE_BISHOP, 0.05, CORNERS) \
/**/ /**/
#define MIDDLE_POSITIONAL_BONUS_3 \ #define MIDDLE_POSITIONAL_BONUS_3 \
/* piece bonus area*/ \ /* piece bonus area*/ \
X(PIECE_BISHOP, 0.02, REL_BISHOP_QUEEN_ATTACK) \ X(PIECE_BISHOP, 0.05, BOARD_CENTER_6X6) \
X(PIECE_KNIGHT, 0.05, BOARD_CENTER_6X6) \
/**/ /**/
/* ------------------------------- end game -------------------------------- */ /* ------------------------------- end game -------------------------------- */
@@ -363,17 +395,17 @@ ULL
/**/ /**/
struct posmod { struct posmod {
bitboard const area; Bb64 const area;
double const val; double const val;
}; };
static inline struct posmod positional_modifier(enum player pl, enum game_progress st, size_t layer, enum piece pz) static inline struct posmod positional_modifier(Side8 pl, enum game_progress st, size_t layer, Piece8 pz)
{ {
static struct posmod const static struct posmod const
lookup[PLAYER_COUNT][GP_COUNT][POSITIONAL_MODIFIER_COUNT][PIECE_COUNT] = { lookup[SIDE_COUNT][GP_COUNT][POSITIONAL_MODIFIER_COUNT][PIECE_COUNT] = {
#define X(p, b, a) [p] = {.area = (a), .val = b}, #define X(p, b, a) [p] = {.area = (a), .val = b},
#define REL_BITBOARD BITBOARD_WHITE #define REL_BITBOARD BITBOARD_WHITE
[PLAYER_WHITE] = { [SIDE_WHITE] = {
[GP_OPENING] = { [GP_OPENING] = {
{EARLY_POSITIONAL_BONUS_0}, {EARLY_POSITIONAL_BONUS_0},
{EARLY_POSITIONAL_BONUS_1}, {EARLY_POSITIONAL_BONUS_1},
@@ -396,7 +428,7 @@ static inline struct posmod positional_modifier(enum player pl, enum game_progre
#undef REL_BITBOARD #undef REL_BITBOARD
#define REL_BITBOARD BITBOARD_BLACK #define REL_BITBOARD BITBOARD_BLACK
[PLAYER_BLACK] = { [SIDE_BLACK] = {
[GP_OPENING] = { [GP_OPENING] = {
{EARLY_POSITIONAL_BONUS_0}, {EARLY_POSITIONAL_BONUS_0},
{EARLY_POSITIONAL_BONUS_1}, {EARLY_POSITIONAL_BONUS_1},

13
engine-macros.h Normal file
View File

@@ -0,0 +1,13 @@
#pragma once
#define STR(x) #x
#if !defined(NDEBUG) && defined(USE_PRINTF)
#define assuming(expr) \
((expr) ? 0 : (fprintf(stderr, "assumption <" #expr "> failed on line %d\n", __LINE__), __builtin_trap(), 0))
#elif !defined(NDEBUG)
#define assuming(expr) \
((expr) ? 0 : (__builtin_trap(), 0))
#else
#define assuming(expr) ((expr) ? 0 : (__builtin_unreachable(), 0))
#endif

276
engine-move-generation.h Normal file
View File

@@ -0,0 +1,276 @@
#pragma once
#define MOVE_CASTLE_KINGSIDE_WHITE (struct move) \
{.from = SQ_E1, .to = SQ_G1}
#define MOVE_CASTLE_QUEENSIDE_WHITE (struct move) \
{.from = SQ_E1, .to = SQ_C1}
#define MOVE_CASTLE_KINGSIDE_BLACK (struct move) \
{.from = SQ_E8, .to = SQ_G8}
#define MOVE_CASTLE_QUEENSIDE_BLACK (struct move) \
{.from = SQ_E8, .to = SQ_C8}
static inline
struct move move_make(struct pos const* restrict pos,
Piece8 piece,
Index8 from,
Index8 to,
uint8_t add_attr)
{
(void)piece;
(void)pos;
(void)add_attr;
#if 0
Side8 const us = pos->moving_side;
Side8 const them = other_side(us);
Bb64 const their_occ = pos->occupied[them];
Bb64 const tomask = MASK_FROM_SQ(to);
Bb64 const finishline = (us == SIDE_WHITE ? RANK_MASK_8 : RANK_MASK_1);
uint8_t attr = 0ULL;
#define MASK_IF8(x) ((~(uint8_t)0U) + (uint8_t)!(x))
attr |= MATTR_CAPTURE & MASK_IF8(tomask & their_occ);
attr |= MATTR_CAPTURE & MASK_IF8((piece == PIECE_PAWN) && tomask & pos->ep_targets);
attr |= MATTR_PROMOTE & MASK_IF8((piece == PIECE_PAWN) && (tomask & finishline));
attr |= add_attr;
#undef MASK_IF8
return (struct move){.from = from, .to = to, .attr = attr};
#endif
return (struct move){.from = from, .to = to, .attr = add_attr};
}
#define MOVE_MAX 128
enum move_gen_type {
MG_ALL,
MG_CAPTURES,
MG_CHECKS,
MG_QUIETS,
};
static void all_pseudolegal_from_piece(struct pos const* restrict pos,
enum move_gen_type type,
Piece8 piece,
Side8 us,
Bb64 piece_mask,
Bb64 allowed,
size_t* restrict out_count,
struct move out[restrict static MOVE_MAX])
{
assuming(piece != PIECE_PAWN);
Side8 them = other_side(us);
Bb64 const our_occ = pos->occupied[us];
Bb64 const all_occ = pos->occupied[SIDE_WHITE] | pos->occupied[SIDE_BLACK];
if (type == MG_CHECKS) {
allowed &= non_pawn_piece_attacks(piece, pos->pieces[them][PIECE_KING], all_occ);
}
/* pray this gets constprop'ed */
while (piece_mask) {
Sq8 from = bitboard_pop_lsb(&piece_mask);
Bb64 move_mask = non_pawn_piece_attacks_from_index(piece, from, all_occ)
& ~our_occ
& allowed
;
while (move_mask) {
Sq8 const to = bitboard_pop_lsb(&move_mask);
assuming(*out_count < MOVE_MAX); \
out[(*out_count)++] = move_make(pos, piece, from, to, 0);
}
}
}
#define DEFINE_ALL_PSEUDOLEGAL_PAWN_MOVES(side, opp_side, side_enum, inverse_direction, pawn_rank) \
static void all_pseudolegal_pawn_moves_##side(struct pos const* restrict pos,\
enum move_gen_type type,\
Bb64 piece_mask,\
Bb64 allowed,\
size_t* restrict out_count,\
struct move out[restrict static MOVE_MAX])\
{\
Bb64 const all_occ = pos->occupied[SIDE_WHITE] | pos->occupied[SIDE_BLACK];\
\
if (type == MG_CHECKS) {\
allowed &= pawn_attacks_##opp_side(pos->pieces[other_side(side_enum)][PIECE_KING]);\
}\
Bb64 sp = pawn_single_push_##side(piece_mask, ~all_occ)\
& allowed\
;\
while (sp) {\
Sq8 const to = bitboard_pop_lsb(&sp);\
Sq8 const from = SQ_SHIFT_##inverse_direction(to, 1);\
out[(*out_count)++] = move_make(pos, PIECE_PAWN, from, to, 0);\
}\
\
Bb64 dp = pawn_double_push_##side(piece_mask & pawn_rank, ~all_occ)\
& allowed\
;\
while (dp) {\
Sq8 const to = bitboard_pop_lsb(&dp);\
Sq8 const from = SQ_SHIFT_##inverse_direction(to, 2);\
out[(*out_count)++] = move_make(pos, PIECE_PAWN, from, to, 0);\
}\
}
DEFINE_ALL_PSEUDOLEGAL_PAWN_MOVES(white, black, SIDE_WHITE, SOUTH, RANK_MASK_2)
DEFINE_ALL_PSEUDOLEGAL_PAWN_MOVES(black, white, SIDE_BLACK, NORTH, RANK_MASK_7)
#define DEFINE_ALL_PSEUDOLEGAL_PAWN_ATTACKS(side, opp_side, side_enum, inverse_direction) \
static void all_pseudolegal_pawn_attacks_##side(struct pos const* restrict pos,\
enum move_gen_type type,\
Bb64 piece_mask,\
Bb64 allowed,\
size_t* restrict out_count,\
struct move out[restrict static MOVE_MAX])\
{\
Bb64 const their_occ = pos->occupied[other_side(side_enum)];\
\
if (type == MG_CHECKS) {\
allowed &= pawn_attacks_##opp_side(pos->pieces[other_side(side_enum)][PIECE_KING]);\
}\
\
Bb64 ratk = pawn_attacks_right_##side(piece_mask)\
& (their_occ | pos->ep_targets)\
& allowed\
;\
while (ratk) {\
Sq8 const to = bitboard_pop_lsb(&ratk);\
Sq8 const from = SQ_SHIFT_WEST(SQ_SHIFT_##inverse_direction(to, 1), 1);\
assuming(*out_count < MOVE_MAX); \
out[(*out_count)++] = move_make(pos, PIECE_PAWN, from, to, 0);\
}\
\
Bb64 latk = pawn_attacks_left_##side(piece_mask)\
& (their_occ | pos->ep_targets)\
& allowed\
;\
while (latk) {\
Sq8 const to = bitboard_pop_lsb(&latk);\
Sq8 const from = SQ_SHIFT_EAST(SQ_SHIFT_##inverse_direction(to, 1), 1);\
assuming(*out_count < MOVE_MAX); \
out[(*out_count)++] = move_make(pos, PIECE_PAWN, from, to, 0);\
}\
}
DEFINE_ALL_PSEUDOLEGAL_PAWN_ATTACKS(white, black, SIDE_WHITE, SOUTH)
DEFINE_ALL_PSEUDOLEGAL_PAWN_ATTACKS(black, white, SIDE_BLACK, NORTH)
static void all_pseudolegal_moves(struct pos const* restrict pos,
enum move_gen_type type,
Side8 us,
size_t* restrict out_count,
struct move out[restrict static MOVE_MAX])
{
Side8 const them = other_side(us);
if (type == MG_CHECKS && pos->pieces[them][PIECE_KING] == 0ULL) {
return;
}
Bb64 const kmask = pos->pieces[us][PIECE_KING];
assuming(kmask);
Sq8 const ksq = bitboard_lsb(kmask);
Bb64 const chk = checkers(pos, us);
Bb64 const their_threats = all_threats_from_side(pos, them);
Bb64 const their_occ = pos->occupied[them];
Bb64 const all_occ = pos->occupied[SIDE_WHITE] | pos->occupied[SIDE_BLACK];
Bb64 allowed;
if (type == MG_CAPTURES) {
allowed = their_occ;
} else if (type == MG_QUIETS) {
allowed = ~their_occ;
} else if (type == MG_ALL) {
allowed = ~0ULL;
} else {
allowed = ~0ULL;
}
Bb64 king_allowed = allowed;
if (chk) {
if (bitboard_more_than_one(chk)) {
if (type == MG_ALL) {
/* no other piece can fix check if the king has two attackers or more */
all_pseudolegal_from_piece(pos, type, PIECE_KING, us, pos->pieces[us][PIECE_KING], ~their_threats, out_count, out);
}
return;
}
Sq8 const asq = bitboard_lsb(chk);
Bb64 const blocking_mask = between_mask(ksq, asq);
allowed &= blocking_mask | chk;
}
if (type == MG_CAPTURES || type == MG_CHECKS || type == MG_ALL) {
Bb64 const x = (type == MG_CHECKS ? pos->ep_targets : 0ULL);
if (us == SIDE_WHITE) {
all_pseudolegal_pawn_attacks_white(pos, type, pos->pieces[us][PIECE_PAWN], allowed | x, out_count, out);
} else {
all_pseudolegal_pawn_attacks_black(pos, type, pos->pieces[us][PIECE_PAWN], allowed | x, out_count, out);
}
}
if (type == MG_QUIETS || type == MG_CHECKS || type == MG_ALL) {
if (us == SIDE_WHITE) {
all_pseudolegal_pawn_moves_white(pos, type, pos->pieces[us][PIECE_PAWN], allowed, out_count, out);
} else {
all_pseudolegal_pawn_moves_black(pos, type, pos->pieces[us][PIECE_PAWN], allowed, out_count, out);
}
}
all_pseudolegal_from_piece(pos, type, PIECE_BISHOP, us, pos->pieces[us][PIECE_BISHOP], allowed, out_count, out);
all_pseudolegal_from_piece(pos, type, PIECE_KNIGHT, us, pos->pieces[us][PIECE_KNIGHT], allowed, out_count, out);
all_pseudolegal_from_piece(pos, type, PIECE_ROOK, us, pos->pieces[us][PIECE_ROOK], allowed, out_count, out);
all_pseudolegal_from_piece(pos, type, PIECE_QUEEN, us, pos->pieces[us][PIECE_QUEEN], allowed, out_count, out);
all_pseudolegal_from_piece(pos, type, PIECE_KING, us, pos->pieces[us][PIECE_KING], ~their_threats & king_allowed, out_count, out);
if (type == MG_CHECKS) {
Bb64 discovering = pinning_lines_to_target(pos, us, bitboard_lsb(pos->pieces[them][PIECE_KING]));
all_pseudolegal_from_piece(pos, MG_ALL, PIECE_BISHOP, us, discovering & pos->pieces[us][PIECE_BISHOP], ~discovering, out_count, out);
all_pseudolegal_from_piece(pos, MG_ALL, PIECE_KNIGHT, us, discovering & pos->pieces[us][PIECE_KNIGHT], ~discovering, out_count, out);
all_pseudolegal_from_piece(pos, MG_ALL, PIECE_ROOK, us, discovering & pos->pieces[us][PIECE_ROOK], ~discovering, out_count, out);
all_pseudolegal_from_piece(pos, MG_ALL, PIECE_QUEEN, us, discovering & pos->pieces[us][PIECE_QUEEN], ~discovering, out_count, out);
all_pseudolegal_from_piece(pos, MG_ALL, PIECE_KING, us, discovering & pos->pieces[us][PIECE_KING], ~discovering & ~their_threats, out_count, out);
}
/* castling */
if (!chk && type != MG_CAPTURES) {
bool can_castle_kingside, can_castle_queenside;
Bb64 const blocked = pos->occupied[SIDE_WHITE] | pos->occupied[SIDE_BLACK] | their_threats;
if (us == SIDE_WHITE) {
can_castle_kingside = !(blocked & (SQMASK_F1 | SQMASK_G1))
&& (pos->pieces[us][PIECE_ROOK] & SQMASK_H1)
&& !pos->castling_illegal[us][CASTLE_KINGSIDE];
can_castle_queenside = !(blocked & (SQMASK_C1 | SQMASK_D1))
&& (pos->pieces[us][PIECE_ROOK] & SQMASK_A1)
&& !pos->castling_illegal[us][CASTLE_QUEENSIDE];
} else {
can_castle_kingside = !(blocked & (SQMASK_F8 | SQMASK_G8))
&& (pos->pieces[us][PIECE_ROOK] & SQMASK_H8)
&& !pos->castling_illegal[us][CASTLE_KINGSIDE];
can_castle_queenside = !(blocked & (SQMASK_C8 | SQMASK_D8))
&& (pos->pieces[us][PIECE_ROOK] & SQMASK_A8)
&& !pos->castling_illegal[us][CASTLE_QUEENSIDE];
}
if (can_castle_kingside) {
out[(*out_count)++] = us == SIDE_WHITE
? MOVE_CASTLE_KINGSIDE_WHITE
: MOVE_CASTLE_KINGSIDE_BLACK;
}
if (can_castle_queenside) {
out[(*out_count)++] = us == SIDE_WHITE
? MOVE_CASTLE_QUEENSIDE_WHITE
: MOVE_CASTLE_QUEENSIDE_BLACK;
}
}
}

141
engine-tt.h Normal file
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@@ -0,0 +1,141 @@
#pragma once
struct search_option {
/* TODO: optimize order of fields and size */
double score;
struct move move;
uint64_t hash;
uint8_t init : 1;
enum tt_flag {TT_EXACT, TT_LOWER, TT_UPPER} flag : 3;
int8_t depth : 4;
};
#define TT_ADDRESS_BITS 24
#define TT_ENTRIES (1ULL<<TT_ADDRESS_BITS)
struct tt {
struct search_option* entries/*[TT_ENTRIES]*/; /* must be initialized somewhere */
#ifndef NDEBUG
/* stats */
uint64_t collisions;
uint64_t hits;
uint64_t probes;
uint64_t overwritten;
uint64_t insertions;
#endif
};
struct zobrist {
uint64_t piece_keys[SQ_COUNT][SIDE_COUNT][PIECE_COUNT];
uint64_t ep_targets[SQ_COUNT];
uint64_t castling_keys[SIDE_COUNT][CASTLE_COUNT];
bool init;
};
static struct zobrist zobrist;
static void init_zobrist()
{
for (Sq8 sq = SQ_BEGIN; sq < SQ_COUNT; ++sq) {
for (Side8 pl = SIDE_BEGIN; pl < SIDE_COUNT; ++pl) {
for (Piece8 piece = PIECE_BEGIN; piece < PIECE_COUNT; ++piece) {
zobrist.piece_keys[sq][pl][piece] = my_rand64();
}
}
zobrist.ep_targets[sq] = my_rand64();
}
for (Side8 pl = SIDE_BEGIN; pl < SIDE_COUNT; ++pl) {
for (enum castle_direction d = CASTLE_BEGIN; d < CASTLE_COUNT; ++d) {
zobrist.castling_keys[pl][d] = my_rand64();
}
}
zobrist.init = true;
}
static inline uint64_t tt_hash_update(uint64_t hash,
Sq8 sq,
Side8 us,
Piece8 piece)
{
if (!zobrist.init) {
init_zobrist();
}
return hash ^ zobrist.piece_keys[sq][us][piece];
}
static inline uint64_t tt_hash_update_castling_rights(uint64_t hash,
Side8 us,
enum castle_direction dir)
{
if (!zobrist.init) {
init_zobrist();
}
return hash ^ zobrist.castling_keys[us][dir];
}
static inline uint64_t tt_hash_update_ep_targets(uint64_t hash, Sq8 sq)
{
if (!zobrist.init) {
init_zobrist();
}
assuming(sq < SQ_COUNT);
return hash ^ zobrist.ep_targets[sq];
}
static inline uint64_t tt_hash_switch_side(uint64_t hash)
{
if (!zobrist.init) {
init_zobrist();
}
return ~hash;
}
static inline struct search_option tt_get(struct tt* tt, uint64_t hash)
{
uint64_t const addr = hash % TT_ENTRIES;
struct search_option tte = tt->entries[addr];
#ifndef NDEBUG
tt->probes += 1;
if (tte.init && tte.hash == hash) {
tt->hits += 1;
} else if (tte.init && tte.hash != hash) {
tt->collisions += 1;
}
#endif
return tte;
}
static inline void tt_insert(struct tt* tt, uint64_t hash, struct search_option so)
{
uint64_t const addr = hash % TT_ENTRIES;
so.init = true;
tt->entries[addr] = so;
#ifndef NDEBUG
tt->insertions += 1;
#endif
}
/* tt_insert_maybe inserts only if heuristics say it's a good idea. There are
* two considerations:
* - higher depth saves more work per probe hit
* - entries closer to the leaves are more likely to be searched multiple time
*/
static inline void tt_insert_maybe(struct tt* tt, uint64_t hash, struct search_option so)
{
uint64_t const addr = hash % TT_ENTRIES;
#if 0
struct search_option* tte = &tt->entries[addr];
if (so.depth < tte->depth) {
*tte = so;
}
#endif
so.init = true;
tt->entries[addr] = so;
#ifndef NDEBUG
tt->insertions += 1;
#endif
}

285
engine-types.h Normal file
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@@ -0,0 +1,285 @@
#pragma once
/* ----------- Index8 ----------- */
typedef uint8_t Index8;
#define MASK_SHIFT_NORTH(b, n) ((b) << ((Index8)(n)*8U))
#define MASK_SHIFT_SOUTH(b, n) ((b) >> ((Index8)(n)*8U))
#define MASK_SHIFT_WEST(b, n) ((b) >> ((Index8)(n)*1U))
#define MASK_SHIFT_EAST(b, n) ((b) << ((Index8)(n)*1U))
#define SQ_SHIFT_NORTH(i, n) ((i) + ((Index8)(n)*8U))
#define SQ_SHIFT_SOUTH(i, n) ((i) - ((Index8)(n)*8U))
#define SQ_SHIFT_WEST(i, n) ((i) - ((Index8)(n)*1U))
#define SQ_SHIFT_EAST(i, n) ((i) + ((Index8)(n)*1U))
#define SQ_FROM_RF(rank, file) ((Index8)(8U*(Index8)(rank) + (Index8)(file)))
/* ----------- file_index ----------- */
enum file_index : Index8 {
FILE_INDEX_BEGIN,
FILE_INDEX_A = FILE_INDEX_BEGIN,
FILE_INDEX_B,
FILE_INDEX_C,
FILE_INDEX_D,
FILE_INDEX_E,
FILE_INDEX_F,
FILE_INDEX_G,
FILE_INDEX_H,
FILE_INDEX_COUNT,
};
char const file_index_char[FILE_INDEX_COUNT] = {
[FILE_INDEX_A] = 'A',
[FILE_INDEX_B] = 'B',
[FILE_INDEX_C] = 'C',
[FILE_INDEX_D] = 'D',
[FILE_INDEX_E] = 'E',
[FILE_INDEX_F] = 'F',
[FILE_INDEX_G] = 'G',
[FILE_INDEX_H] = 'H',
};
/* ----------- rank_index ----------- */
enum rank_index : Index8 {
RANK_INDEX_BEGIN,
RANK_INDEX_1 = RANK_INDEX_BEGIN,
RANK_INDEX_2,
RANK_INDEX_3,
RANK_INDEX_4,
RANK_INDEX_5,
RANK_INDEX_6,
RANK_INDEX_7,
RANK_INDEX_8,
RANK_INDEX_COUNT,
};
char const rank_index_char[RANK_INDEX_COUNT] = {
[RANK_INDEX_1] = '1',
[RANK_INDEX_2] = '2',
[RANK_INDEX_3] = '3',
[RANK_INDEX_4] = '4',
[RANK_INDEX_5] = '5',
[RANK_INDEX_6] = '6',
[RANK_INDEX_7] = '7',
[RANK_INDEX_8] = '8',
};
/* ----------- Sq8 ----------- */
#define SQMASK_PREFIX SQMASK_
#define SQUARES_LIST_BEGIN \
X(A, 1)
#define SQUARES_LIST \
X(A, 1) \
X(A, 2) \
X(A, 3) \
X(A, 4) \
X(A, 5) \
X(A, 6) \
X(A, 7) \
X(A, 8) \
X(B, 1) \
X(B, 2) \
X(B, 3) \
X(B, 4) \
X(B, 5) \
X(B, 6) \
X(B, 7) \
X(B, 8) \
X(C, 1) \
X(C, 2) \
X(C, 3) \
X(C, 4) \
X(C, 5) \
X(C, 6) \
X(C, 7) \
X(C, 8) \
X(D, 1) \
X(D, 2) \
X(D, 3) \
X(D, 4) \
X(D, 5) \
X(D, 6) \
X(D, 7) \
X(D, 8) \
X(E, 1) \
X(E, 2) \
X(E, 3) \
X(E, 4) \
X(E, 5) \
X(E, 6) \
X(E, 7) \
X(E, 8) \
X(F, 1) \
X(F, 2) \
X(F, 3) \
X(F, 4) \
X(F, 5) \
X(F, 6) \
X(F, 7) \
X(F, 8) \
X(G, 1) \
X(G, 2) \
X(G, 3) \
X(G, 4) \
X(G, 5) \
X(G, 6) \
X(G, 7) \
X(G, 8) \
X(H, 1) \
X(H, 2) \
X(H, 3) \
X(H, 4) \
X(H, 5) \
X(H, 6) \
X(H, 7) \
X(H, 8)
typedef enum sq8 : uint8_t {
#define X(file, rank) SQ_##file##rank = SQ_FROM_RF(RANK_INDEX_##rank, FILE_INDEX_##file),
SQUARES_LIST
SQ_COUNT,
#undef X
/* define iterator begin enum */
#define X(file, rank) SQ_BEGIN = SQ_##file##rank,
SQUARES_LIST_BEGIN
#undef X
} Sq8;
static char* const sq8_display[SQ_COUNT] = {
#define X(file, rank) \
[SQ_##file##rank] = STR(file##rank),
SQUARES_LIST
#undef X
};
static char* const sq8_str[SQ_COUNT] = {
#define X(file, rank) \
[SQ_##file##rank] = STR(SQ_##file##rank),
SQUARES_LIST
#undef X
};
static inline enum file_index sq_to_file(Sq8 p)
{
return p % 8ULL;
}
static inline enum rank_index sq_to_rank(Sq8 p)
{
return p / 8ULL;
}
/* ----------- Side8 ----------- */
typedef enum side : uint8_t {
SIDE_WHITE,
SIDE_BLACK,
SIDE_COUNT,
SIDE_BEGIN = SIDE_WHITE,
} Side8;
static inline Side8 other_side(Side8 p)
{
return (p == SIDE_WHITE ? SIDE_BLACK : SIDE_WHITE);
}
static char const* side_str[SIDE_COUNT] = {
[SIDE_WHITE] = "SIDE_WHITE",
[SIDE_BLACK] = "SIDE_BLACK",
};
/* ----------- Piece8 ----------- */
/* https://en.wikipedia.org/wiki/X_macro */
/* enum value white char white unicode black char black unicode */
#define PIECES \
X(PIECE_PAWN, 1.0, 'P', 0x2659, 'p', 0x265F) \
X(PIECE_KING, 0.0, 'K', 0x2654, 'k', 0x265A) \
X(PIECE_QUEEN, 9.0, 'Q', 0x2655, 'q', 0x265B) \
X(PIECE_BISHOP, 3.0, 'B', 0x2657, 'b', 0x265D) \
X(PIECE_ROOK, 5.0, 'R', 0x2656, 'r', 0x265C) \
X(PIECE_KNIGHT, 3.0, 'N', 0x2658, 'n', 0x265E)
typedef enum piece : uint8_t {
#define X(e, v, wc, wu, bc, bu) e,
PIECES
PIECE_COUNT,
PIECE_BEGIN = 0,
#undef X
} Piece8;
static double piece_value[PIECE_COUNT] = {
#define X(e, v, wc, wu, bc, bu) [e] = v,
PIECES
#undef X
};
static char const* piece_str[PIECE_COUNT] = {
#define X(e, v, wc, wu, bc, bu) [e] = STR(e),
PIECES
#undef X
};
struct piece_side {Piece8 piece; Side8 side;} const piece_and_side_from_char[256] = {
#define X(e, v, wc, wu, bc, bu) \
[(uint8_t)bc] = {.piece = e, .side = SIDE_BLACK}, \
[(uint8_t)wc] = {.piece = e, .side = SIDE_WHITE},
PIECES
#undef X
};
static char const piece_char[SIDE_COUNT][PIECE_COUNT] = {
[SIDE_WHITE] = {
#define X(e, v, wc, wu, bc, bu) [e] = wc,
PIECES
#undef X
},
[SIDE_BLACK] = {
#define X(e, v, wc, wu, bc, bu) [e] = bc,
PIECES
#undef X
}
};
static int const piece_unicode[SIDE_COUNT][PIECE_COUNT] = {
[SIDE_WHITE] = {
#define X(e, v, wc, wu, bc, bu) [e] = wu,
PIECES
#undef X
},
[SIDE_BLACK] = {
#define X(e, v, wc, wu, bc, bu) [e] = bu,
PIECES
#undef X
}
};
/* ----------- moves ----------- */
enum {
MATTR_PROMOTE = 1<<0,
};
struct move {
Sq8 from;
Sq8 to;
uint8_t attr;
#define APPEAL_MAX UINT8_MAX
uint8_t appeal;
};
_Static_assert(sizeof(struct move) == 4,
"this static assuming is here to check when sizeof(move) changes");
#define NULL_MOVE (struct move){0}
#define IS_NULL_MOVE(m) ((m).from == (m).to)
/* ----------- castle_direction ----------- */
enum castle_direction {
CASTLE_BEGIN,
CASTLE_KINGSIDE = CASTLE_BEGIN,
CASTLE_QUEENSIDE,
CASTLE_COUNT,
};

1960
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357
tests.c
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@@ -1,4 +1,5 @@
#define USE_PRINTF
#define _XOPEN_SOURCE 500 #define _XOPEN_SOURCE 500
#include <unistd.h> /* usleep */ #include <unistd.h> /* usleep */
#include <pthread.h> #include <pthread.h>
@@ -12,10 +13,12 @@
/* Tests are mostly generated by ChatGPT */ /* Tests are mostly generated by ChatGPT */
#define test_expect(expr) if (!(expr)) { fprintf(stderr, "test failed: expected <" #expr ">\n"); exit(EXIT_FAILURE); }
static void print_rook_test(const char *label, static void print_rook_test(const char *label,
enum square_index sq, Sq8 sq,
bitboard all_occ, Bb64 all_occ,
bitboard own_occ) Bb64 own_occ)
{ {
printf("\n%s\n", label); printf("\n%s\n", label);
printf("All occ:\n"); printf("All occ:\n");
@@ -23,7 +26,7 @@ static void print_rook_test(const char *label,
printf("Own occ:\n"); printf("Own occ:\n");
bitboard_print(own_occ, stdout); bitboard_print(own_occ, stdout);
const bitboard attacks = rook_attacks_from_index(sq, all_occ) & ~own_occ; const Bb64 attacks = rook_attacks_from_index(sq, all_occ) & ~own_occ;
printf("Rook attacks:\n"); printf("Rook attacks:\n");
bitboard_print(attacks, stdout); bitboard_print(attacks, stdout);
} }
@@ -31,84 +34,84 @@ static void print_rook_test(const char *label,
static void test_rooks() static void test_rooks()
{ {
{ {
const enum square_index sq = SQ_INDEX_A1; const Sq8 sq = SQ_A1;
const bitboard rook = SQ_MASK_A1; const Bb64 rook = SQMASK_A1;
const bitboard all_occ = rook; const Bb64 all_occ = rook;
const bitboard own_occ = rook; const Bb64 own_occ = rook;
/* Expected: full rank 1 and file A, except A1 */ /* Expected: full rank 1 and file A, except A1 */
bitboard expected = (FILE_MASK_A | RANK_MASK_1) & ~SQ_MASK_A1; Bb64 expected = (FILE_MASK_A | RANK_MASK_1) & ~SQMASK_A1;
print_rook_test("Test 1: Rook at A1, empty board", sq, all_occ, own_occ); print_rook_test("Test 1: Rook at A1, empty board", sq, all_occ, own_occ);
const bitboard attacks = rook_attacks_from_index(sq, all_occ) & ~own_occ; const Bb64 attacks = rook_attacks_from_index(sq, all_occ) & ~own_occ;
assert(attacks == expected); test_expect(attacks == expected);
} }
{ {
const enum square_index sq = SQ_INDEX_A1; const Sq8 sq = SQ_A1;
const bitboard rook = SQ_MASK_A1; const Bb64 rook = SQMASK_A1;
const bitboard own_block = SQ_MASK_A2 | SQ_MASK_B1; const Bb64 own_block = SQMASK_A2 | SQMASK_B1;
const bitboard all_occ = rook | own_block; const Bb64 all_occ = rook | own_block;
const bitboard own_occ = all_occ; const Bb64 own_occ = all_occ;
/* Expected: no legal moves (immediately blocked both directions) */ /* Expected: no legal moves (immediately blocked both directions) */
const bitboard expected = 0ULL; const Bb64 expected = 0ULL;
print_rook_test("Test 2: Rook at A1, own blockers A2, B1", sq, all_occ, own_occ); print_rook_test("Test 2: Rook at A1, own blockers A2, B1", sq, all_occ, own_occ);
const bitboard attacks = rook_attacks_from_index(sq, all_occ) & ~own_occ; const Bb64 attacks = rook_attacks_from_index(sq, all_occ) & ~own_occ;
assert(attacks == expected); test_expect(attacks == expected);
} }
{ {
const enum square_index sq = SQ_INDEX_A1; const Sq8 sq = SQ_A1;
const bitboard rook = SQ_MASK_A1; const Bb64 rook = SQMASK_A1;
const bitboard enemies = SQ_MASK_A3 | SQ_MASK_C1; const Bb64 enemies = SQMASK_A3 | SQMASK_C1;
const bitboard all_occ = rook | enemies; const Bb64 all_occ = rook | enemies;
const bitboard own_occ = rook; const Bb64 own_occ = rook;
/* /*
* Expected: * Expected:
* - Along file A: A2, A3 (enemy at A3 is capturable, stop there) * - Along file A: A2, A3 (enemy at A3 is capturable, stop there)
* - Along rank 1: B1, C1 (enemy at C1 capturable, stop there) * - Along rank 1: B1, C1 (enemy at C1 capturable, stop there)
*/ */
bitboard expected = 0ULL; Bb64 expected = 0ULL;
expected |= SQ_MASK_A2 | SQ_MASK_A3; expected |= SQMASK_A2 | SQMASK_A3;
expected |= SQ_MASK_B1 | SQ_MASK_C1; expected |= SQMASK_B1 | SQMASK_C1;
print_rook_test("Test 3: Rook at A1, enemy blockers A3, C1", sq, all_occ, own_occ); print_rook_test("Test 3: Rook at A1, enemy blockers A3, C1", sq, all_occ, own_occ);
const bitboard attacks = rook_attacks_from_index(sq, all_occ) & ~own_occ; const Bb64 attacks = rook_attacks_from_index(sq, all_occ) & ~own_occ;
assert(attacks == expected); test_expect(attacks == expected);
} }
/* Rook Test 6: center rook on empty board */ /* Rook Test 6: center rook on empty board */
{ {
const enum square_index sq = SQ_INDEX_E5; const Sq8 sq = SQ_E5;
const bitboard rook = SQ_MASK_E5; const Bb64 rook = SQMASK_E5;
const bitboard all_occ = rook; const Bb64 all_occ = rook;
const bitboard own_occ = rook; const Bb64 own_occ = rook;
/* Full rank 5 and file E, except E5 itself */ /* Full rank 5 and file E, except E5 itself */
bitboard expected = (FILE_MASK_E | RANK_MASK_5) & ~SQ_MASK_E5; Bb64 expected = (FILE_MASK_E | RANK_MASK_5) & ~SQMASK_E5;
print_rook_test("Rook Test 6: E5, empty board", sq, all_occ, own_occ); print_rook_test("Rook Test 6: E5, empty board", sq, all_occ, own_occ);
bitboard attacks = rook_attacks_from_index(sq, all_occ) & ~own_occ; Bb64 attacks = rook_attacks_from_index(sq, all_occ) & ~own_occ;
assert(attacks == expected); test_expect(attacks == expected);
} }
/* Rook Test 7: center rook, mixed blockers on rays */ /* Rook Test 7: center rook, mixed blockers on rays */
{ {
const enum square_index sq = SQ_INDEX_E5; const Sq8 sq = SQ_E5;
const bitboard rook = SQ_MASK_E5; const Bb64 rook = SQMASK_E5;
/* Friendly: E7 and C5; Enemy: E3 and H5 */ /* Friendly: E7 and C5; Enemy: E3 and H5 */
const bitboard friends = rook | SQ_MASK_E7 | SQ_MASK_C5; const Bb64 friends = rook | SQMASK_E7 | SQMASK_C5;
const bitboard enemies = SQ_MASK_E3 | SQ_MASK_H5; const Bb64 enemies = SQMASK_E3 | SQMASK_H5;
const bitboard all_occ = friends | enemies; const Bb64 all_occ = friends | enemies;
const bitboard own_occ = friends; const Bb64 own_occ = friends;
/* /*
* From E5: * From E5:
@@ -117,73 +120,73 @@ static void test_rooks()
* Left: D5, then friendly C5 (stop before C5) * Left: D5, then friendly C5 (stop before C5)
* Right:F5, G5, H5 (enemy, included, then stop) * Right:F5, G5, H5 (enemy, included, then stop)
*/ */
bitboard expected = 0ULL; Bb64 expected = 0ULL;
expected |= SQ_MASK_E6; expected |= SQMASK_E6;
expected |= SQ_MASK_E4 | SQ_MASK_E3; expected |= SQMASK_E4 | SQMASK_E3;
expected |= SQ_MASK_D5; expected |= SQMASK_D5;
expected |= SQ_MASK_F5 | SQ_MASK_G5 | SQ_MASK_H5; expected |= SQMASK_F5 | SQMASK_G5 | SQMASK_H5;
print_rook_test("Rook Test 7: E5, friends E7/C5, enemies E3/H5", sq, all_occ, own_occ); print_rook_test("Rook Test 7: E5, friends E7/C5, enemies E3/H5", sq, all_occ, own_occ);
bitboard attacks = rook_attacks_from_index(sq, all_occ) & ~own_occ; Bb64 attacks = rook_attacks_from_index(sq, all_occ) & ~own_occ;
assert(attacks == expected); test_expect(attacks == expected);
} }
/* Rook Test 8: edge rook on empty board (top edge, not corner) */ /* Rook Test 8: edge rook on empty board (top edge, not corner) */
{ {
const enum square_index sq = SQ_INDEX_C8; const Sq8 sq = SQ_C8;
const bitboard rook = SQ_MASK_C8; const Bb64 rook = SQMASK_C8;
const bitboard all_occ = rook; const Bb64 all_occ = rook;
const bitboard own_occ = rook; const Bb64 own_occ = rook;
/* /*
* From C8: * From C8:
* Down file C: C7..C1 * Down file C: C7..C1
* Across rank 8: A8,B8,D8,E8,F8,G8,H8 * Across rank 8: A8,B8,D8,E8,F8,G8,H8
*/ */
bitboard expected = 0ULL; Bb64 expected = 0ULL;
expected |= (FILE_MASK_C & ~SQ_MASK_C8); expected |= (FILE_MASK_C & ~SQMASK_C8);
expected |= (RANK_MASK_8 & ~SQ_MASK_C8); expected |= (RANK_MASK_8 & ~SQMASK_C8);
print_rook_test("Rook Test 8: C8, empty board", sq, all_occ, own_occ); print_rook_test("Rook Test 8: C8, empty board", sq, all_occ, own_occ);
bitboard attacks = rook_attacks_from_index(sq, all_occ) & ~own_occ; Bb64 attacks = rook_attacks_from_index(sq, all_occ) & ~own_occ;
assert(attacks == expected); test_expect(attacks == expected);
} }
/* Rook Test 9: rook completely boxed in by friendly orthogonal neighbors */ /* Rook Test 9: rook completely boxed in by friendly orthogonal neighbors */
{ {
const enum square_index sq = SQ_INDEX_D4; const Sq8 sq = SQ_D4;
const bitboard rook = SQ_MASK_D4; const Bb64 rook = SQMASK_D4;
const bitboard friends = rook | const Bb64 friends = rook |
SQ_MASK_D5 | SQ_MASK_D3 | SQMASK_D5 | SQMASK_D3 |
SQ_MASK_C4 | SQ_MASK_E4; SQMASK_C4 | SQMASK_E4;
const bitboard enemies = 0ULL; const Bb64 enemies = 0ULL;
const bitboard all_occ = friends | enemies; const Bb64 all_occ = friends | enemies;
const bitboard own_occ = friends; const Bb64 own_occ = friends;
/* All four rays are immediately blocked by own pieces */ /* All four rays are immediately blocked by own pieces */
const bitboard expected = 0ULL; const Bb64 expected = 0ULL;
print_rook_test("Rook Test 9: D4, boxed by own pieces at D5/D3/C4/E4", print_rook_test("Rook Test 9: D4, boxed by own pieces at D5/D3/C4/E4",
sq, all_occ, own_occ); sq, all_occ, own_occ);
bitboard attacks = rook_attacks_from_index(sq, all_occ) & ~own_occ; Bb64 attacks = rook_attacks_from_index(sq, all_occ) & ~own_occ;
assert(attacks == expected); test_expect(attacks == expected);
} }
/* Rook Test 10: rook on file with non-interfering off-ray pieces */ /* Rook Test 10: rook on file with non-interfering off-ray pieces */
{ {
const enum square_index sq = SQ_INDEX_A4; const Sq8 sq = SQ_A4;
const bitboard rook = SQ_MASK_A4; const Bb64 rook = SQMASK_A4;
/* Pieces placed off the rook's rank/file; they should have no effect */ /* Pieces placed off the rook's rank/file; they should have no effect */
const bitboard off_ray = SQ_MASK_C1 | SQ_MASK_F6 | SQ_MASK_H8; const Bb64 off_ray = SQMASK_C1 | SQMASK_F6 | SQMASK_H8;
(void)off_ray; (void)off_ray;
const bitboard friends = rook | SQ_MASK_C1; const Bb64 friends = rook | SQMASK_C1;
const bitboard enemies = SQ_MASK_F6 | SQ_MASK_H8; const Bb64 enemies = SQMASK_F6 | SQMASK_H8;
const bitboard all_occ = friends | enemies; const Bb64 all_occ = friends | enemies;
const bitboard own_occ = friends; const Bb64 own_occ = friends;
/* /*
* From A4: * From A4:
@@ -191,22 +194,21 @@ static void test_rooks()
* Rank 4: B4..H4 * Rank 4: B4..H4
* Pieces not on file A or rank 4 must not change attacks. * Pieces not on file A or rank 4 must not change attacks.
*/ */
bitboard expected = 0ULL; Bb64 expected = 0ULL;
expected |= (FILE_MASK_A | RANK_MASK_4) & ~SQ_MASK_A4; expected |= (FILE_MASK_A | RANK_MASK_4) & ~SQMASK_A4;
print_rook_test("Rook Test 10: A4, random off-ray pieces C1/F6/H8", print_rook_test("Rook Test 10: A4, random off-ray pieces C1/F6/H8",
sq, all_occ, own_occ); sq, all_occ, own_occ);
bitboard attacks = rook_attacks_from_index(sq, all_occ) & ~own_occ; Bb64 attacks = rook_attacks_from_index(sq, all_occ) & ~own_occ;
assert(attacks == expected); test_expect(attacks == expected);
} }
} }
static void print_bishop_test(const char *label, static void print_bishop_test(const char *label,
enum square_index sq, Sq8 sq,
bitboard all_occ, Bb64 all_occ,
bitboard own_occ) Bb64 own_occ)
{ {
fprintf(stderr, "\n%s\n", label); fprintf(stderr, "\n%s\n", label);
fprintf(stderr, "All occ:\n"); fprintf(stderr, "All occ:\n");
@@ -214,7 +216,7 @@ static void print_bishop_test(const char *label,
fprintf(stderr, "Own occ:\n"); fprintf(stderr, "Own occ:\n");
bitboard_print(own_occ, stderr); bitboard_print(own_occ, stderr);
const bitboard attacks = bishop_attacks_from_index(sq, all_occ) & ~own_occ; const Bb64 attacks = bishop_attacks_from_index(sq, all_occ) & ~own_occ;
fprintf(stderr, "Bishop attacks:\n"); fprintf(stderr, "Bishop attacks:\n");
bitboard_print(attacks, stderr); bitboard_print(attacks, stderr);
} }
@@ -223,10 +225,10 @@ static void test_bishops(void)
{ {
/* Test 1: Bishop at D4 on empty board (only bishop present) */ /* Test 1: Bishop at D4 on empty board (only bishop present) */
{ {
const enum square_index sq = SQ_INDEX_D4; const Sq8 sq = SQ_D4;
const bitboard bishop = SQ_MASK_D4; const Bb64 bishop = SQMASK_D4;
const bitboard all_occ = bishop; const Bb64 all_occ = bishop;
const bitboard own_occ = bishop; const Bb64 own_occ = bishop;
/* /*
* Expected diagonals from D4: * Expected diagonals from D4:
@@ -235,24 +237,24 @@ static void test_bishops(void)
* SE: E3, F2, G1 * SE: E3, F2, G1
* SW: C3, B2, A1 * SW: C3, B2, A1
*/ */
bitboard expected = 0ULL; Bb64 expected = 0ULL;
expected |= SQ_MASK_E5 | SQ_MASK_F6 | SQ_MASK_G7 | SQ_MASK_H8; expected |= SQMASK_E5 | SQMASK_F6 | SQMASK_G7 | SQMASK_H8;
expected |= SQ_MASK_C5 | SQ_MASK_B6 | SQ_MASK_A7; expected |= SQMASK_C5 | SQMASK_B6 | SQMASK_A7;
expected |= SQ_MASK_E3 | SQ_MASK_F2 | SQ_MASK_G1; expected |= SQMASK_E3 | SQMASK_F2 | SQMASK_G1;
expected |= SQ_MASK_C3 | SQ_MASK_B2 | SQ_MASK_A1; expected |= SQMASK_C3 | SQMASK_B2 | SQMASK_A1;
print_bishop_test("Bishop Test 1: D4, empty board", sq, all_occ, own_occ); print_bishop_test("Bishop Test 1: D4, empty board", sq, all_occ, own_occ);
const bitboard attacks = bishop_attacks_from_index(sq, all_occ) & ~own_occ; const Bb64 attacks = bishop_attacks_from_index(sq, all_occ) & ~own_occ;
assert(attacks == expected); test_expect(attacks == expected);
} }
/* Test 2: Bishop at C1 on empty board (only bishop present) */ /* Test 2: Bishop at C1 on empty board (only bishop present) */
{ {
const enum square_index sq = SQ_INDEX_C1; const Sq8 sq = SQ_C1;
const bitboard bishop = SQ_MASK_C1; const Bb64 bishop = SQMASK_C1;
const bitboard all_occ = bishop; const Bb64 all_occ = bishop;
const bitboard own_occ = bishop; const Bb64 own_occ = bishop;
/* /*
* From C1, diagonals: * From C1, diagonals:
@@ -260,25 +262,25 @@ static void test_bishops(void)
* NW: B2, A3 * NW: B2, A3
* SE / SW: none (edge of board) * SE / SW: none (edge of board)
*/ */
bitboard expected = 0ULL; Bb64 expected = 0ULL;
expected |= SQ_MASK_D2 | SQ_MASK_E3 | SQ_MASK_F4 | expected |= SQMASK_D2 | SQMASK_E3 | SQMASK_F4 |
SQ_MASK_G5 | SQ_MASK_H6; SQMASK_G5 | SQMASK_H6;
expected |= SQ_MASK_B2 | SQ_MASK_A3; expected |= SQMASK_B2 | SQMASK_A3;
print_bishop_test("Bishop Test 2: C1, empty board", sq, all_occ, own_occ); print_bishop_test("Bishop Test 2: C1, empty board", sq, all_occ, own_occ);
const bitboard attacks = bishop_attacks_from_index(sq, all_occ) & ~own_occ; const Bb64 attacks = bishop_attacks_from_index(sq, all_occ) & ~own_occ;
assert(attacks == expected); test_expect(attacks == expected);
} }
/* Test 3: Bishop at D4, friendly blockers at F6 and B2 (no enemies) */ /* Test 3: Bishop at D4, friendly blockers at F6 and B2 (no enemies) */
{ {
const enum square_index sq = SQ_INDEX_D4; const Sq8 sq = SQ_D4;
const bitboard bishop = SQ_MASK_D4; const Bb64 bishop = SQMASK_D4;
const bitboard friends = bishop | SQ_MASK_F6 | SQ_MASK_B2; const Bb64 friends = bishop | SQMASK_F6 | SQMASK_B2;
const bitboard enemies = 0ULL; const Bb64 enemies = 0ULL;
const bitboard all_occ = friends | enemies; const Bb64 all_occ = friends | enemies;
const bitboard own_occ = friends; const Bb64 own_occ = friends;
/* /*
* From D4: * From D4:
@@ -287,26 +289,26 @@ static void test_bishops(void)
* NW: C5, B6, A7 (no blockers) * NW: C5, B6, A7 (no blockers)
* SE: E3, F2, G1 (no blockers) * SE: E3, F2, G1 (no blockers)
*/ */
bitboard expected = 0ULL; Bb64 expected = 0ULL;
expected |= SQ_MASK_E5; expected |= SQMASK_E5;
expected |= SQ_MASK_C3; expected |= SQMASK_C3;
expected |= SQ_MASK_C5 | SQ_MASK_B6 | SQ_MASK_A7; expected |= SQMASK_C5 | SQMASK_B6 | SQMASK_A7;
expected |= SQ_MASK_E3 | SQ_MASK_F2 | SQ_MASK_G1; expected |= SQMASK_E3 | SQMASK_F2 | SQMASK_G1;
print_bishop_test("Bishop Test 3: D4, friendly blockers F6, B2", sq, all_occ, own_occ); print_bishop_test("Bishop Test 3: D4, friendly blockers F6, B2", sq, all_occ, own_occ);
const bitboard attacks = bishop_attacks_from_index(sq, all_occ) & ~own_occ; const Bb64 attacks = bishop_attacks_from_index(sq, all_occ) & ~own_occ;
assert(attacks == expected); test_expect(attacks == expected);
} }
/* Test 4: Bishop at D4, enemy blockers at F6 and B2 (no other friends) */ /* Test 4: Bishop at D4, enemy blockers at F6 and B2 (no other friends) */
{ {
const enum square_index sq = SQ_INDEX_D4; const Sq8 sq = SQ_D4;
const bitboard bishop = SQ_MASK_D4; const Bb64 bishop = SQMASK_D4;
const bitboard friends = bishop; const Bb64 friends = bishop;
const bitboard enemies = SQ_MASK_F6 | SQ_MASK_B2; const Bb64 enemies = SQMASK_F6 | SQMASK_B2;
const bitboard all_occ = friends | enemies; const Bb64 all_occ = friends | enemies;
const bitboard own_occ = friends; const Bb64 own_occ = friends;
/* /*
* From D4: * From D4:
@@ -315,27 +317,27 @@ static void test_bishops(void)
* NW: C5, B6, A7 * NW: C5, B6, A7
* SE: E3, F2, G1 * SE: E3, F2, G1
*/ */
bitboard expected = 0ULL; Bb64 expected = 0ULL;
expected |= SQ_MASK_E5 | SQ_MASK_F6; expected |= SQMASK_E5 | SQMASK_F6;
expected |= SQ_MASK_C3 | SQ_MASK_B2; expected |= SQMASK_C3 | SQMASK_B2;
expected |= SQ_MASK_C5 | SQ_MASK_B6 | SQ_MASK_A7; expected |= SQMASK_C5 | SQMASK_B6 | SQMASK_A7;
expected |= SQ_MASK_E3 | SQ_MASK_F2 | SQ_MASK_G1; expected |= SQMASK_E3 | SQMASK_F2 | SQMASK_G1;
print_bishop_test("Bishop Test 4: D4, enemy blockers F6, B2", sq, all_occ, own_occ); print_bishop_test("Bishop Test 4: D4, enemy blockers F6, B2", sq, all_occ, own_occ);
const bitboard attacks = bishop_attacks_from_index(sq, all_occ) & ~own_occ; const Bb64 attacks = bishop_attacks_from_index(sq, all_occ) & ~own_occ;
assert(attacks == expected); test_expect(attacks == expected);
} }
/* Test 5: Bishop at D4, mixed friend/enemy + another friendly bishop elsewhere */ /* Test 5: Bishop at D4, mixed friend/enemy + another friendly bishop elsewhere */
{ {
const enum square_index sq = SQ_INDEX_D4; const Sq8 sq = SQ_D4;
const bitboard bishop1 = SQ_MASK_D4; /* tested bishop */ const Bb64 bishop1 = SQMASK_D4; /* tested bishop */
const bitboard bishop2 = SQ_MASK_F4; /* another friendly bishop */ const Bb64 bishop2 = SQMASK_F4; /* another friendly bishop */
const bitboard friends = bishop1 | bishop2 | SQ_MASK_F6; const Bb64 friends = bishop1 | bishop2 | SQMASK_F6;
const bitboard enemies = SQ_MASK_B2; const Bb64 enemies = SQMASK_B2;
const bitboard all_occ = friends | enemies; const Bb64 all_occ = friends | enemies;
const bitboard own_occ = friends; const Bb64 own_occ = friends;
/* /*
* From D4: * From D4:
@@ -345,24 +347,23 @@ static void test_bishops(void)
* SE: E3, F2, G1 * SE: E3, F2, G1
* Bishop at F4 is irrelevant; it does not sit on a diagonal from D4. * Bishop at F4 is irrelevant; it does not sit on a diagonal from D4.
*/ */
bitboard expected = 0ULL; Bb64 expected = 0ULL;
expected |= SQ_MASK_E5; expected |= SQMASK_E5;
expected |= SQ_MASK_C3 | SQ_MASK_B2; expected |= SQMASK_C3 | SQMASK_B2;
expected |= SQ_MASK_C5 | SQ_MASK_B6 | SQ_MASK_A7; expected |= SQMASK_C5 | SQMASK_B6 | SQMASK_A7;
expected |= SQ_MASK_E3 | SQ_MASK_F2 | SQ_MASK_G1; expected |= SQMASK_E3 | SQMASK_F2 | SQMASK_G1;
print_bishop_test("Bishop Test 5: D4, mixed friend/enemy + extra bishop F4", sq, all_occ, own_occ); print_bishop_test("Bishop Test 5: D4, mixed friend/enemy + extra bishop F4", sq, all_occ, own_occ);
const bitboard attacks = bishop_attacks_from_index(sq, all_occ) & ~own_occ; const Bb64 attacks = bishop_attacks_from_index(sq, all_occ) & ~own_occ;
assert(attacks == expected); test_expect(attacks == expected);
} }
/* Test 6: Bishop at H8, no occupancy */ /* Test 6: Bishop at H8, no occupancy */
{ {
const enum square_index sq = SQ_INDEX_H8; const Sq8 sq = SQ_H8;
const bitboard enemies = 0ULL; const Bb64 all_occ = 0ULL;
const bitboard all_occ = 0ULL; const Bb64 own_occ = MASK_FROM_SQ(sq);
const bitboard own_occ = SQ_MASK_FROM_INDEX(sq);
/* /*
* From D4: * From D4:
@@ -372,17 +373,17 @@ static void test_bishops(void)
* SE: E3, F2, G1 * SE: E3, F2, G1
* Bishop at F4 is irrelevant; it does not sit on a diagonal from D4. * Bishop at F4 is irrelevant; it does not sit on a diagonal from D4.
*/ */
bitboard expected = 0ULL; Bb64 expected = 0ULL;
expected = SQ_MASK_G7 | SQ_MASK_F6 | SQ_MASK_E5 | SQ_MASK_D4 | expected = SQMASK_G7 | SQMASK_F6 | SQMASK_E5 | SQMASK_D4 |
SQ_MASK_C3 | SQ_MASK_B2 | SQ_MASK_A1; SQMASK_C3 | SQMASK_B2 | SQMASK_A1;
print_bishop_test("Bishop Test 6: H8, no occupancy", sq, all_occ, own_occ); print_bishop_test("Bishop Test 6: H8, no occupancy", sq, all_occ, own_occ);
const bitboard attacks = bishop_attacks_from_index(sq, all_occ) & ~own_occ; const Bb64 attacks = bishop_attacks_from_index(sq, all_occ) & ~own_occ;
if (attacks != expected) { if (attacks != expected) {
bitboard_print(attacks, stderr); bitboard_print(attacks, stderr);
} }
assert(attacks == expected); test_expect(attacks == expected);
} }
printf("\nAll bishop_attacks_from_index tests passed.\n"); printf("\nAll bishop_attacks_from_index tests passed.\n");
@@ -403,10 +404,13 @@ void* set_after_timeout(void* x)
int main() int main()
{ {
bool const print_threats = true;
printf("sizeof pos: %zu\n", sizeof (struct pos)); printf("sizeof pos: %zu\n", sizeof (struct pos));
printf("sizeof tt: %zu\n", sizeof (struct tt)); printf("sizeof tt: %zu\n", sizeof (struct tt));
printf("sizeof board: %zu\n", sizeof (struct board));
#if 1 #if 0
test_rooks(); test_rooks();
test_bishops(); test_bishops();
#endif #endif
@@ -426,35 +430,38 @@ int main()
//board_load_fen_unsafe(b, "1n1q1rk1/r1p2P2/1p1pp2p/pB2P3/2P5/PPN5/6b1/3QK1NR b - - 0 1"); //board_load_fen_unsafe(b, "1n1q1rk1/r1p2P2/1p1pp2p/pB2P3/2P5/PPN5/6b1/3QK1NR b - - 0 1");
//board_load_fen_unsafe(b, "8/8/2kr4/6R1/4K3/6P1/8/8 b - - 0 1"); //board_load_fen_unsafe(b, "8/8/2kr4/6R1/4K3/6P1/8/8 b - - 0 1");
//board_load_fen_unsafe(b, "5R2/7k/P7/6pp/3B4/1PPK2bP/4r3/8 b - - 3 57"); //board_load_fen_unsafe(b, "8/8/5R2/8/2K3PP/1B2k3/8/8 b - - 1 4");
//board_print_fen(b->pos, stdout); //board_print_fen(b->pos, stdout);
board_print(&b->pos, NULL, stdout); board_print(&b->pos, NULL, stdout, print_threats);
struct move moves[MOVE_MAX]; struct move moves[MOVE_MAX];
size_t move_count;
for (int turn = 0; turn < 200; ++turn) { for (int turn = 0; turn < 200; ++turn) {
size_t move_count = 0; move_count = 0;
all_moves(&b->pos, b->pos.player, &move_count, moves); all_pseudolegal_moves(&b->pos, MG_ALL, b->pos.moving_side, &move_count, moves);
if (move_count == 0) { if (move_count == 0) {
printf("no moves for %s, aborting\n", player_str[b->pos.player]); printf("no moves for %s, aborting\n", side_str[b->pos.moving_side]);
board_print_threats(&b->pos, stdout, NULL); board_print(&b->pos, NULL, stdout, print_threats);
b->pos.player = opposite_player(b->pos.player); b->pos.moving_side = other_side(b->pos.moving_side);
board_print_threats(&b->pos, stdout, NULL); board_print(&b->pos, NULL, stdout, print_threats);
break; break;
} }
pthread_t timer; pthread_t timer;
atomic_bool searching; atomic_bool searching;
atomic_init(&searching, true); atomic_init(&searching, true);
#if 1
struct timeout_params timer_params = { struct timeout_params timer_params = {
.x = &searching, .x = &searching,
.v = false, .v = false,
.us = 3*1000*1000, .us = 2*1000*1000,
}; };
pthread_create(&timer, NULL, set_after_timeout, &timer_params); pthread_create(&timer, NULL, set_after_timeout, &timer_params);
#endif
struct search_result sr = search(b, b->pos.player, 5, &searching); struct search_result sr = search(b, b->pos.moving_side, 25, &searching);
struct move move = sr.move; struct move move = sr.move;
double const score = sr.score; double const score = sr.score;
@@ -463,23 +470,23 @@ int main()
" .from = %s, (%s)\n" " .from = %s, (%s)\n"
" .to = %s,\n" " .to = %s,\n"
" .score = %lf,\n" " .score = %lf,\n"
" .mask = ", " .mask = "
"",
turn, turn,
square_index_display[move.from], sq8_display[move.from],
piece_str[b->mailbox[move.from]], piece_str[b->mailbox[move.from]],
square_index_display[move.to], sq8_display[move.to],
score score
); );
if (move.attr & MATTR_CAPTURE) printf("MATTR_CAPTURE ");
if (move.attr & MATTR_PROMOTE) printf("MATTR_PROMOTE ");
printf("\n}\n"); printf("\n}\n");
enum move_result const r = board_move_2(b, move); enum move_result const r = board_move(b, move);
#if 1 #if 1
board_print_fen(&b->pos, stdout); board_print_fen(&b->pos, stdout);
tt_print_stats(&b->tt, stdout); tt_print_stats(&b->tt, stdout);
board_print(&b->pos, &move, stdout); board_print(&b->pos, &move, stdout, print_threats);
fprintf(stderr, "board hist len: %zu\n", b->hist.length);
#endif #endif
if (r == MR_STALEMATE) { if (r == MR_STALEMATE) {
@@ -487,11 +494,11 @@ int main()
break; break;
} }
if (b->pos.pieces[PLAYER_WHITE][PIECE_KING] == 0ULL) { if (b->pos.pieces[SIDE_WHITE][PIECE_KING] == 0ULL) {
printf("white king gone!!\n"); printf("white king gone!!\n");
exit(1); exit(1);
} }
if (b->pos.pieces[PLAYER_BLACK][PIECE_KING] == 0ULL) { if (b->pos.pieces[SIDE_BLACK][PIECE_KING] == 0ULL) {
printf("black king gone!!\n"); printf("black king gone!!\n");
exit(1); exit(1);
} }