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Stricter condition to check for dc candidates

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Another optimization that let us remove another half
of find_hidden_checks(them, DcCandidates) calls.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-02-28 13:43:49 +01:00
parent 1f97b48a31
commit 6a8cfe79da
1 changed files with 5 additions and 7 deletions
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12
src/position.cpp
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@ -725,16 +725,14 @@ void Position::update_hidden_checks(Square from, Square to) {
if ( (moveSquares & RookPseudoAttacks[ksq]) && (checkerCaptured || (rooks_and_queens(them) & RookPseudoAttacks[ksq]))
|| (moveSquares & BishopPseudoAttacks[ksq]) && (checkerCaptured || (bishops_and_queens(them) & BishopPseudoAttacks[ksq])))
{
find_hidden_checks(them, Pinned);
// If we don't have opponent dc candidates and we are moving in the
// attack line then won't be dc candidates also after the move.
// attack line then won't be any dc candidates also after the move.
if ( st->dcCandidates[them]
|| bit_is_set(RookPseudoAttacks[ksq], from)
|| bit_is_set(BishopPseudoAttacks[ksq], from))
find_hidden_checks(them, Pinned | DcCandidates);
else
find_hidden_checks(them, Pinned);
|| (bit_is_set(RookPseudoAttacks[ksq], from) && (rooks_and_queens(them) & RookPseudoAttacks[ksq]))
|| (bit_is_set(BishopPseudoAttacks[ksq], from) && (bishops_and_queens(them) & BishopPseudoAttacks[ksq])))
find_hidden_checks(them, DcCandidates);
}
}