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Fixed an embarassing Chess960 bug found by Alexander Schmidt.

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It turned out that we used do_move_bb to update the king and rook
bitboards when making and unmaking castling moves, which obviously
doesn't work in Chess960, where the source and destination squares
for the king or rook could be identical.

No functional change in normal chess.
This commit is contained in:
Tord Romstad
2009-10-05 16:46:18 +02:00
parent 3701a8e57d
commit 32dfaa56b0
1 changed files with 32 additions and 21 deletions
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47
src/position.cpp
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@@ -985,16 +985,21 @@ void Position::do_castle_move(Move m) {
rto = relative_square(us, SQ_D1);
}
// Move the pieces
Bitboard kmove_bb = make_move_bb(kfrom, kto);
do_move_bb(&(byColorBB[us]), kmove_bb);
do_move_bb(&(byTypeBB[KING]), kmove_bb);
do_move_bb(&(byTypeBB[0]), kmove_bb); // HACK: byTypeBB[0] == occupied squares
// Remove pieces from source squares:
clear_bit(&(byColorBB[us]), kfrom);
clear_bit(&(byTypeBB[KING]), kfrom);
clear_bit(&(byTypeBB[0]), kfrom); // HACK: byTypeBB[0] == occupied squares
clear_bit(&(byColorBB[us]), rfrom);
clear_bit(&(byTypeBB[ROOK]), rfrom);
clear_bit(&(byTypeBB[0]), rfrom); // HACK: byTypeBB[0] == occupied squares
Bitboard rmove_bb = make_move_bb(rfrom, rto);
do_move_bb(&(byColorBB[us]), rmove_bb);
do_move_bb(&(byTypeBB[ROOK]), rmove_bb);
do_move_bb(&(byTypeBB[0]), rmove_bb); // HACK: byTypeBB[0] == occupied squares
// Put pieces on destination squares:
set_bit(&(byColorBB[us]), kto);
set_bit(&(byTypeBB[KING]), kto);
set_bit(&(byTypeBB[0]), kto); // HACK: byTypeBB[0] == occupied squares
set_bit(&(byColorBB[us]), rto);
set_bit(&(byTypeBB[ROOK]), rto);
set_bit(&(byTypeBB[0]), rto); // HACK: byTypeBB[0] == occupied squares
// Update board array
Piece king = piece_of_color_and_type(us, KING);
@@ -1106,6 +1111,7 @@ void Position::undo_move(Move m) {
pieceList[us][PAWN][index[to]] = to;
}
// Put the piece back at the source square
Bitboard move_bb = make_move_bb(to, from);
do_move_bb(&(byColorBB[us]), move_bb);
@@ -1184,16 +1190,21 @@ void Position::undo_castle_move(Move m) {
assert(piece_on(kto) == piece_of_color_and_type(us, KING));
assert(piece_on(rto) == piece_of_color_and_type(us, ROOK));
// Put the pieces back at the source square
Bitboard kmove_bb = make_move_bb(kto, kfrom);
do_move_bb(&(byColorBB[us]), kmove_bb);
do_move_bb(&(byTypeBB[KING]), kmove_bb);
do_move_bb(&(byTypeBB[0]), kmove_bb); // HACK: byTypeBB[0] == occupied squares
// Remove pieces from destination squares:
clear_bit(&(byColorBB[us]), kto);
clear_bit(&(byTypeBB[KING]), kto);
clear_bit(&(byTypeBB[0]), kto); // HACK: byTypeBB[0] == occupied squares
clear_bit(&(byColorBB[us]), rto);
clear_bit(&(byTypeBB[ROOK]), rto);
clear_bit(&(byTypeBB[0]), rto); // HACK: byTypeBB[0] == occupied squares
Bitboard rmove_bb = make_move_bb(rto, rfrom);
do_move_bb(&(byColorBB[us]), rmove_bb);
do_move_bb(&(byTypeBB[ROOK]), rmove_bb);
do_move_bb(&(byTypeBB[0]), rmove_bb); // HACK: byTypeBB[0] == occupied squares
// Put pieces on source squares:
set_bit(&(byColorBB[us]), kfrom);
set_bit(&(byTypeBB[KING]), kfrom);
set_bit(&(byTypeBB[0]), kfrom); // HACK: byTypeBB[0] == occupied squares
set_bit(&(byColorBB[us]), rfrom);
set_bit(&(byTypeBB[ROOK]), rfrom);
set_bit(&(byTypeBB[0]), rfrom); // HACK: byTypeBB[0] == occupied squares
// Update board
board[rto] = board[kto] = EMPTY;