olemorud/chess-engine
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Major rework: add search timer, evaluation improvements, more

Browse Source 
ADDITIONAL CHANGES

Alpha-Beta search
* Change back to recursive alphabeta with implicit stack
* Add atomic_bool parameter that stops search when set to false
* Update tests accordingly

Evaluation
* Fix bug where black pawns are using white's positional modifier bonus

Makefile
* Add -march=native to clang release builds
This commit is contained in:
Ole Morud
2025-12-26 16:18:09 +01:00
parent e5b6886f40
commit 160ea82549
5 changed files with 600 additions and 428 deletions
Download Patch File Download Diff File Expand all files Collapse all files

57
board_print.h
View File

@@ -172,20 +172,20 @@ static void board_print_fen(struct pos const* pos, FILE* out)
if (pos->ep_targets) {
/* should be ep target square in algebraic notation */
enum square_index const sqi = bitboard_lsb(pos->ep_targets);
enum square_index const sqi = bitboard_lsb(pos->ep_targets);
assert(sqi >= SQ_INDEX_BEGIN && sqi < SQ_INDEX_COUNT);
assert(sqi >= SQ_INDEX_BEGIN && sqi < SQ_INDEX_COUNT);
enum file_index const fi = index_to_file(sqi);
enum rank_index const ri = index_to_rank(sqi);
enum file_index const fi = index_to_file(sqi);
enum rank_index const ri = index_to_rank(sqi);
int const fch = tolower(file_index_char[fi]);
int const rch = tolower(rank_index_char[ri]);
int const fch = tolower(file_index_char[fi]);
int const rch = tolower(rank_index_char[ri]);
assert(fch >= 'a' && fch <= 'h');
assert(rch >= '1' && rch <= '8');
assert(fch >= 'a' && fch <= 'h');
assert(rch >= '1' && rch <= '8');
fprintf(out, " %c%c", fch, rch);
fprintf(out, " %c%c", fch, rch);
} else {
fprintf(out, " -");
}
@@ -199,6 +199,7 @@ static void board_print_fen(struct pos const* pos, FILE* out)
static void board_print(const struct pos* pos, struct move* move, FILE* out)
{
int buf[8][8] = {0};
int color[8][8] = {0};
for (enum player player = PLAYER_BEGIN; player < PLAYER_COUNT; ++player) {
for (enum piece piece = PIECE_BEGIN; piece < PIECE_COUNT; ++piece) {
@@ -207,7 +208,10 @@ static void board_print(const struct pos* pos, struct move* move, FILE* out)
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];
buf[i][j] = piece_unicode[PLAYER_BLACK][piece];
color[i][j] = (player == PLAYER_WHITE)
? 1
: 2;
}
}
}
@@ -221,19 +225,36 @@ static void board_print(const struct pos* pos, struct move* move, FILE* out)
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, 104); /* 44: blue*/
} else if (move && n == move->to) {
fprintf(out, "\033[%d;%dm", 30, 44); /* 104: bright blue*/
} else {
/* 45: magenta, 47: white */
fprintf(out, "\033[%d;%dm", 30, (i+j) % 2 ? 45 : 47);
int bg, fg;
/**/ if (color[i][j] == 1) {
fg = 97; /* bright white */
}
else if (color[i][j] == 2) {
fg = 30; /* black */
}
else {
fg = 35; /* magenta (should not happen) */
}
if (move && n == move->from) {
bg = 104; /* blue */
} else if (move && n == move->to) {
bg = 44; /* bright blue */
} else {
/* 45: magenta,
* 47: white */
bg = (i+j) % 2 ? 45 : 47;
}
fprintf(out, "\033[%d;%dm", fg, bg);
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] = ' ' */
is not sufficient when buf[i][j] = ' ' */
}
}
fprintf(out, "\033[0m"); /* reset background color */