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Chess: Add pawn promotion to any piece

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This commit is contained in:
Peter Elliott 2020-08-11 22:53:11 -06:00 • committed by Andreas Kling
parent 9d40472721
commit abd1f7e563
7 changed files with 144 additions and 5 deletions
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26
Games/Chess/Chess.cpp
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@ -153,6 +153,9 @@ 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)
return false;
if (piece.type == Type::Pawn) {
int dir = (colour == Colour::White) ? +1 : -1;
unsigned start_rank = (colour == Colour::White) ? 1 : 6;
@ -304,8 +307,6 @@ bool Chess::apply_illegal_move(const Move& move, Colour colour)
{
m_turn = opposing_colour(colour);
// FIXME: pawn promotion
m_last_move = move;
if (move.from == Square("a1") || move.to == Square("a1") || move.from == Square("e1"))
@ -347,6 +348,13 @@ bool Chess::apply_illegal_move(const Move& move, Colour colour)
}
}
if (get_piece(move.from).type == Type::Pawn && ((colour == Colour::Black && move.to.rank == 0) || (colour == Colour::White && move.to.rank == 7))) {
// Pawn Promotion
set_piece(move.to, { colour, move.promote_to });
set_piece(move.from, EmptyPiece);
return true;
}
if (get_piece(move.from).type == Type::Pawn && move.from.file != move.to.file && get_piece(move.to).type == Type::None) {
// En passant.
if (colour == Colour::White) {
@ -379,3 +387,17 @@ Chess::Result Chess::game_result() const
return Result::StaleMate;
}
bool Chess::is_promotion_move(const Move& move, Colour colour) const
{
if (colour == Colour::None)
colour = turn();
if (!is_legal(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)))
return true;
return false;
}