chess_interface_dart

Complete chess functionalities including FEN initialization, en-passant, checkmate and draw rules. This is a pure dart package for backend and doesn't include flutter components for front-end. Visit chess_interface for complete front-end package

Features

• ✅ Built-in move validation for all standard piece types
• 🔄 Supports en passant, castling, and pawn promotion logic
• 📐 Interface-driven board interaction for flexible state management
• ⏱️ Countdown stream for both players.

Getting Started

Add the package to your pubspec.yaml:

dependencies:
  chess_interface_dart:
    git:
      url: https://github.com/mryadavdilip/chess_interface_dart.git

OR

dependencies:
  chess_interface_dart: ^1.0.8

Then import these:

import 'package:chess_board_widget/logical_interface/interface.dart';

Example

ChessBoardInterface game = ChessBoardInterface(
    // optional
    fen: 'qkN/p7/8/8/8...',
    
    // optional
    timeLimit: Duration(minutes: 10),
  );

Move Validation

Use MoveValidator.isValidMove() to validate legal chess moves:

bool isValid = MoveValidator.isValidMove(ChessBoardInterface game, Position from, Position to);

It supports:

• All standard chess moves
• Pawn special rules
• Castling logic (including history tracking)
• En passant and double pawn pushes

Arbiter

Arbiter to handle events like game over, time out and pawn promotion:

And more..

File Structure

• arbiter.dart – Game over, timeOut, and promotion handler
• interface.dart – Board interaction interface
• move_validator.dart – Move legality checker
• piece.dart – Piece model and asset loader

Contributing

Contributions are welcome! Please open issues and pull requests to help improve this Package.

License

MIT License. See LICENSE for details.