Chess and chess variant rules and operations in TypeScript.

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• Read and write FEN
• Vocabulary
  • Square
  • SquareSet (implemented as bitboards)
  • Color
  • Role (piece type)
  • Piece (Role and Color)
  • Board (map of piece positions)
  • Castles
  • Setup (a not necessarily legal position)
  • Position (base class for legal positions, Chess is a concrete implementation)
• Variant rules: Standard chess, Crazyhouse, King of the Hill, Three-check, Antichess, Atomic, Horde, Racing Kings
  • Move making
  • Legal move and drop move generation
  • Game end and outcome
  • Insufficient material
  • Setup validation
• Supports Chess960
• Attacks and rays using hyperbola quintessence (faster to initialize than magic bitboards)
• Read and write UCI move notation
• Read and write SAN
• Read and write PGN
  • Parser supports asynchronous streaming
  • Game tree model
  • Transform game tree to augment nodes with arbitrary user data
  • Parse comments with evaluations, clocks and shapes
• Transformations: Mirroring and rotating
• Compatibility: chessground and scalachess

import { parseFen } from 'chessops/fen';
import { Chess } from 'chessops/chess';

const setup = parseFen('r1bqkbnr/ppp2Qpp/2np4/4p3/2B1P3/8/PPPP1PPP/RNB1K1NR b KQkq - 0 4').unwrap();
const pos = Chess.fromSetup(setup).unwrap();
console.assert(pos.isCheckmate());

chessops is licensed under the GNU General Public License 3 or any later version at your choice. See LICENSE.txt for details.