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Add file distance condition in move_is_legal()

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Found another missed control in move_is_legal() thanks to
brute force testing.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2011-05-22 09:35:34 +01:00
parent ff9e49bac9
commit 21fc66c246
1 changed files with 16 additions and 12 deletions
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28
src/position.cpp
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@ -712,16 +712,20 @@ bool Position::move_is_legal(const Move m, Bitboard pinned) const {
case DELTA_SE:
// Capture. The destination square must be occupied by an enemy
// piece (en passant captures was handled earlier).
if (color_of_piece_on(to) != them)
return false;
break;
if (color_of_piece_on(to) != them)
return false;
// From and to files must be one file apart, avoids a7h5
if (abs(square_file(from) - square_file(to)) != 1)
return false;
break;
case DELTA_N:
case DELTA_S:
// Pawn push. The destination square must be empty.
if (!square_is_empty(to))
return false;
break;
if (!square_is_empty(to))
return false;
break;
case DELTA_NN:
// Double white pawn push. The destination square must be on the fourth
@ -731,17 +735,17 @@ bool Position::move_is_legal(const Move m, Bitboard pinned) const {
|| !square_is_empty(to)
|| !square_is_empty(from + DELTA_N))
return false;
break;
break;
case DELTA_SS:
// Double black pawn push. The destination square must be on the fifth
// rank, and both the destination square and the square between the
// source and destination squares must be empty.
if ( square_rank(to) != RANK_5
|| !square_is_empty(to)
|| !square_is_empty(from + DELTA_S))
return false;
break;
if ( square_rank(to) != RANK_5
|| !square_is_empty(to)
|| !square_is_empty(from + DELTA_S))
return false;
break;
default:
return false;