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Extend move_is_legal() to work also when in check

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This patch is a prerequisite to use TT phase
during evasions.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-11-05 12:52:40 +01:00
parent 423b8b9ded
commit 1c73c1c150
3 changed files with 31 additions and 6 deletions
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10
src/movegen.cpp
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@@ -296,12 +296,10 @@ bool move_is_legal(const Position& pos, const Move m) {
/// Fast version of move_is_legal() that takes a position a move and a
/// bitboard of pinned pieces as input, and tests whether the move is legal.
/// This version must only be used when the side to move is not in check.
bool move_is_legal(const Position& pos, const Move m, Bitboard pinned) {
assert(pos.is_ok());
assert(!pos.is_check());
assert(move_is_ok(m));
assert(pinned == pos.pinned_pieces(pos.side_to_move()));
@@ -383,13 +381,13 @@ bool move_is_legal(const Position& pos, const Move m, Bitboard pinned) {
return false;
}
// The move is pseudo-legal, check if it is also legal
return pos.pl_move_is_legal(m, pinned);
return pos.is_check() ? pos.pl_move_is_evasion(m, pinned) : pos.pl_move_is_legal(m, pinned);
}
// Luckly we can handle all the other pieces in one go
return ( bit_is_set(pos.attacks_from(pc, from), to)
&& pos.pl_move_is_legal(m, pinned)
&& !move_is_promotion(m));
return bit_is_set(pos.attacks_from(pc, from), to)
&& (pos.is_check() ? pos.pl_move_is_evasion(m, pinned) : pos.pl_move_is_legal(m, pinned))
&& !move_is_promotion(m);
}