Add 'ChessBoard::checkers'
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@ -112,6 +112,13 @@ impl ChessBoard {
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self.total_plies
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}
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/// Return the [Bitboard] corresponding to all the opponent's pieces threatening the current
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/// player's king.
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#[inline(always)]
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pub fn checkers(&self) -> Bitboard {
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self.compute_checkers(self.current_player())
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}
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/// Quickly do and undo a move on the [Bitboard]s that are part of the [ChessBoard] state. Does
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/// not account for all non-revertible changes such as en-passant state or half-move clock.
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#[inline(always)]
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@ -723,6 +730,49 @@ mod test {
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assert!(!position.is_valid());
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}
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#[test]
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fn checkers() {
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let position = ChessBoard {
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piece_occupancy: [
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// King
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Square::E2 | Square::E8,
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// Queen
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Square::E7 | Square::H2,
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// Rook
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Square::A2 | Square::E1,
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// Bishop
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Square::D3 | Square::F3,
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// Knight
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Square::C1 | Square::G1,
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// Pawn
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Bitboard::EMPTY,
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],
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color_occupancy: [
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Square::C1 | Square::D3 | Square::E1 | Square::E2 | Square::H2,
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Square::A2 | Square::E7 | Square::E8 | Square::F3 | Square::G1,
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],
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combined_occupancy: Square::A2
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| Square::C1
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| Square::D3
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| Square::E1
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| Square::E2
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| Square::E7
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| Square::E8
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| Square::F3
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| Square::G1
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| Square::H2,
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castle_rights: [CastleRights::NoSide; 2],
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en_passant: None,
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half_move_clock: 0,
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total_plies: 0,
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side: Color::White,
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};
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assert_eq!(
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position.checkers(),
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Square::A2 | Square::E7 | Square::F3 | Square::G1
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);
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}
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#[test]
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fn fen_default_position() {
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let default_position = ChessBoard::default();
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