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generate_checks: fix a bug in black double pawn push

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It was written pos.black_pawn_attacks(ksq) instead of
pos.white_pawn_attacks(ksq)

Updated to the undrlying pos.pawn_attacks(WHITE, ksq)

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2008-10-18 13:58:07 +02:00
parent 35fd5ce5bc
commit 5abe8a0816
1 changed files with 6 additions and 6 deletions
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12
src/movegen.cpp
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@ -152,19 +152,19 @@ int generate_checks(const Position& pos, MoveStack* mlist, Bitboard dc) {
// Direct checks. These are possible only for pawns on neighboring files
// of the enemy king
b1 &= (~dc & neighboring_files_bb(ksq));
b1 &= (~dc & neighboring_files_bb(ksq)); // FIXME why ~dc ??
// Direct checks, single pawn pushes
b2 = (b1 << 8) & empty;
b3 = b2 & pos.black_pawn_attacks(ksq);
while(b3)
b3 = b2 & pos.pawn_attacks(BLACK, ksq);
while (b3)
{
to = pop_1st_bit(&b3);
mlist[n++].move = make_move(to - DELTA_N, to);
}
// Direct checks, double pawn pushes
b3 = ((b2 & Rank3BB) << 8) & empty & pos.black_pawn_attacks(ksq);
b3 = ((b2 & Rank3BB) << 8) & empty & pos.pawn_attacks(BLACK, ksq);
while (b3)
{
to = pop_1st_bit(&b3);
@ -203,7 +203,7 @@ int generate_checks(const Position& pos, MoveStack* mlist, Bitboard dc) {
// Direct checks, single pawn pushes:
b2 = (b1 >> 8) & empty;
b3 = b2 & pos.white_pawn_attacks(ksq);
b3 = b2 & pos.pawn_attacks(WHITE, ksq);
while (b3)
{
to = pop_1st_bit(&b3);
@ -211,7 +211,7 @@ int generate_checks(const Position& pos, MoveStack* mlist, Bitboard dc) {
}
// Direct checks, double pawn pushes
b3 = ((b2 & Rank6BB) >> 8) & empty & pos.black_pawn_attacks(ksq);
b3 = ((b2 & Rank6BB) >> 8) & empty & pos.pawn_attacks(WHITE, ksq);
while (b3)
{
to = pop_1st_bit(&b3);