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Fix a bug in generate_piece_checks()

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We are generating also king moves that give check !

Of course these moves are illegal so are in any case
filtered out in MovePicker. Neverthless we should avoid
to generate them.

Also simplify a bit the code.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-09-21 08:47:47 +01:00
parent 746bcb348f
commit aaffcf973e
1 changed files with 12 additions and 15 deletions
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27
src/movegen.cpp
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@ -848,23 +848,20 @@ namespace {
// Direct checks
b = target & ~dc;
if (Piece != KING || b)
Bitboard checkSqs = pos.attacks_from<Piece>(ksq) & pos.empty_squares();
if (Piece == KING || !checkSqs)
return mlist;
while (b)
{
Bitboard checkSqs = pos.attacks_from<Piece>(ksq) & pos.empty_squares();
if (!checkSqs)
return mlist;
Square from = pop_1st_bit(&b);
if ( (Piece == QUEEN && !(QueenPseudoAttacks[from] & checkSqs))
|| (Piece == ROOK && !(RookPseudoAttacks[from] & checkSqs))
|| (Piece == BISHOP && !(BishopPseudoAttacks[from] & checkSqs)))
continue;
while (b)
{
Square from = pop_1st_bit(&b);
if ( (Piece == QUEEN && !(QueenPseudoAttacks[from] & checkSqs))
|| (Piece == ROOK && !(RookPseudoAttacks[from] & checkSqs))
|| (Piece == BISHOP && !(BishopPseudoAttacks[from] & checkSqs)))
continue;
Bitboard bb = pos.attacks_from<Piece>(from) & checkSqs;
SERIALIZE_MOVES(bb);
}
Bitboard bb = pos.attacks_from<Piece>(from) & checkSqs;
SERIALIZE_MOVES(bb);
}
return mlist;
}