python-chess v0.14.0 Changes: * `Board.attacker_mask()` **has been renamed to** `Board.attackers_mask()` for consistency. * **The signature of** `Board.generate_legal_moves()` **and** `Board.generate_pseudo_legal_moves()` **has been changed.** Previously it was possible to select piece types for selective move generation: `Board.generate_legal_moves(castling=True, pawns=True, knights=True, bishops=True, rooks=True, queens=True, king=True)` Now it is possible to select arbitrary sets of origin and target squares. `to_mask` uses the corresponding rook squares for castling moves. `Board.generate_legal_moves(from_mask=BB_ALL, to_mask=BB)` To generate all knight and queen moves do: `board.generate_legal_moves(board.knights | board.queens)` To generate only castling moves use: `Board.generate_castling_moves(from_mask=BB_ALL, to_mask=BB_ALL)` * Additional hardening has been added on top of the bugfix from v0.13.3. Diagonal skewers on the last double pawn move are now handled correctly, even though such positions can not be reached with a sequence of legal moves. * `chess.syzygy` now uses the more efficient selective move generation. New features: * The following move generation methods have been added: `Board.generate_pseudo_legal_ep(from_mask=BB_ALL, to_mask=BB_ALL)`, `Board.generate_legal_ep(from_mask=BB_ALL, to_mask=BB_ALL)`, `Board.generate_pseudo_legal_captures(from_mask=BB_ALL, to_mask=BB_ALL)`, `Board.generate_legal_captures(from_mask=BB_ALL, to_mask=BB_ALL)`.