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Fix bug where pawn can't promote and capture at the same time

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Ole Morud
2025-12-27 17:33:46 +01:00
parent 160ea82549
commit 4998a057f5
1 changed files with 5 additions and 2 deletions
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7
engine.h
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@@ -1646,10 +1646,12 @@ static enum move_result board_move(struct pos* restrict pos,
else {
POS_MOVE(us, from_piece, move.from, move.to);
/* capture */
/**/ if (to_mask & pos->occupied[them]) {
if (to_mask & pos->occupied[them]) {
POS_REMOVE(them, to_piece, move.to);
}
else if (from_piece == PIECE_PAWN) {
/* promote / ep */
if (from_piece == PIECE_PAWN) {
bitboard const finishline = (us == PLAYER_WHITE ? RANK_MASK_8 : RANK_MASK_1);
/* en passent */
@@ -1669,6 +1671,7 @@ static enum move_result board_move(struct pos* restrict pos,
pos->ep_targets |= RANK_SHIFT_DOWN_1(from_mask);
pos->hash = tt_hash_update_ep_targets(pos->hash, INDEX_SHIFT_DOWN(move.from, 1));
}
/* promote */
else if (to_mask & finishline) {
/* already moved to `move.to` */
POS_REMOVE(us, PIECE_PAWN, move.to);