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Chess: Fix generation of promotion moves

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This commit is contained in:
Peter Elliott 2020-08-17 15:40:55 -06:00 • committed by Andreas Kling
parent a6b68451dc
commit 6c2d0dea91
2 changed files with 27 additions and 12 deletions
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17
Games/Chess/Chess.cpp
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@ -153,7 +153,10 @@ bool Chess::is_legal_no_check(const Move& move, Colour colour) const
if (move.to.rank > 7 || move.to.file > 7)
return false;
if (move.promote_to == Type::Pawn || move.promote_to == Type::King || move.promote_to == Type::None)
if (piece.type != Type::Pawn && move.promote_to != Type::None)
return false;
if (move.promote_to == Type::Pawn || move.promote_to == Type::King)
return false;
if (piece.type == Type::Pawn) {
@ -161,6 +164,14 @@ bool Chess::is_legal_no_check(const Move& move, Colour colour) const
unsigned start_rank = (colour == Colour::White) ? 1 : 6;
unsigned other_start_rank = (colour == Colour::White) ? 6 : 1;
unsigned en_passant_rank = (colour == Colour::White) ? 4 : 3;
unsigned promotion_rank = (colour == Colour::White) ? 7 : 0;
if (move.to.rank == promotion_rank) {
if (move.promote_to == Type::Pawn || move.promote_to == Type::King || move.promote_to == Type::None)
return false;
} else if (move.promote_to != Type::None) {
return false;
}
if (move.to.rank == move.from.rank + dir && move.to.file == move.from.file && get_piece(move.to).type == Type::None) {
// Regular pawn move.
@ -457,7 +468,9 @@ bool Chess::is_promotion_move(const Move& move, Colour colour) const
if (colour == Colour::None)
colour = turn();
if (!is_legal(move, colour))
Move queen_move = move;
queen_move.promote_to = Type::Queen;
if (!is_legal(queen_move, colour))
return false;
if (get_piece(move.from).type == Type::Pawn && ((colour == Colour::Black && move.to.rank == 0) || (colour == Colour::White && move.to.rank == 7)))