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8-add-legal-move-filter #16

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Josh merged 6 commits from 8-add-legal-move-filter into main 2025-08-19 19:56:45 +00:00
Conversation 0 Commits 6 Files Changed 4 +22 -4
1 changed files with 22 additions and 4 deletions
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engine/src/bitboard.c
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@@ -220,6 +220,9 @@ void gen_white_pawn_push_promotions(const struct Board *board, struct Move *out,
int to = pop_lsb_index(&promos);
int from = to - 8;
push_move(out, count, from, to, P, Q, MF_PROMO);
push_move(out, count, from, to, P, R, MF_PROMO);
push_move(out, count, from, to, P, B, MF_PROMO);
push_move(out, count, from, to, P, N, MF_PROMO);
}
}
@@ -235,6 +238,9 @@ void gen_black_pawn_push_promotions(const struct Board *board, struct Move *out,
int to = pop_lsb_index(&promos);
int from = to + 8;
push_move(out, count, from, to, p, q, MF_PROMO);
push_move(out, count, from, to, p, r, MF_PROMO);
push_move(out, count, from, to, p, b, MF_PROMO);
push_move(out, count, from, to, p, n, MF_PROMO);
}
}
@@ -245,14 +251,20 @@ void gen_white_pawn_capture_promotions(const struct Board *board, struct Move *o
while (left) {
int to = pop_lsb_index(&left);
int from = to - 7;
push_move(out, count,from, to, P, Q, MF_CAPTURE | MF_PROMO);
push_move(out, count, from, to, P, Q, MF_CAPTURE | MF_PROMO);
push_move(out, count, from, to, P, R, MF_CAPTURE | MF_PROMO);
push_move(out, count, from, to, P, B, MF_CAPTURE | MF_PROMO);
push_move(out, count, from, to, P, N, MF_CAPTURE | MF_PROMO);
}
// right capture: +9, mask off file H
uint64_t right = ((board->pieces[P] & ~FILE_H) << 9) & opp & RANK_8;
while (right) {
int to = pop_lsb_index(&right);
int from = to - 9;
push_move(out, count,from, to, P, Q, MF_CAPTURE | MF_PROMO);
push_move(out, count, from, to, P, Q, MF_CAPTURE | MF_PROMO);
push_move(out, count, from, to, P, R, MF_CAPTURE | MF_PROMO);
push_move(out, count, from, to, P, B, MF_CAPTURE | MF_PROMO);
push_move(out, count, from, to, P, N, MF_CAPTURE | MF_PROMO);
}
}
@@ -263,14 +275,20 @@ void gen_black_pawn_capture_promotions(const struct Board *board, struct Move *o
while (left) {
int to = pop_lsb_index(&left);
int from = to + 7;
push_move(out, count,from, to, p, q, MF_CAPTURE | MF_PROMO);
push_move(out, count, from, to, p, q, MF_CAPTURE | MF_PROMO);
push_move(out, count, from, to, p, r, MF_CAPTURE | MF_PROMO);
push_move(out, count, from, to, p, b, MF_CAPTURE | MF_PROMO);
push_move(out, count, from, to, p, n, MF_CAPTURE | MF_PROMO);
}
// “right” is -9 (mask off file A)
uint64_t right = ((board->pieces[p] & ~FILE_A) >> 9) & opp & RANK_1;
while (right) {
int to = pop_lsb_index(&right);
int from = to + 9;
push_move(out, count,from, to, p, q, MF_CAPTURE | MF_PROMO);
push_move(out, count, from, to, p, q, MF_CAPTURE | MF_PROMO);
push_move(out, count, from, to, p, r, MF_CAPTURE | MF_PROMO);
push_move(out, count, from, to, p, b, MF_CAPTURE | MF_PROMO);
push_move(out, count, from, to, p, n, MF_CAPTURE | MF_PROMO);
}
}