chessops

Chess and chess variant rules and operations in TypeScript.

Documentation

View TypeDoc

Features

• Read and write FEN
• Vocabulary (Square, SquareSet, Color, Role, Piece, Board, Castles, Setup, Position)
• 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
• Read and write UCI move notation
• Read and write SAN
• Position hashing
• Transformations: Mirroring and rotating
• Compatibility: chessground and scalachess

File an issue to request more.

Example

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());

License

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