chess 0.6.5

chess.dart #

chess.dart is a library for legal chess move generation, maintenance of chess game state, and conversion to and from the formats FEN and PGN. It has no external dependencies.

It is a port of chess.js to Dart. It aims to include all of the functionality in the original library, while making the API a little bit more Dart-like. In limited testing, the Dart version (after some refactoring) now outperforms the JavaScript original.

At this early stage, it is working, and passes all of the unit tests which come with chess.js (which you can find in the test directory). However, beyond this, it is not tested in production.

A Random Game #

import "package:chess/chess.dart";

void main() {
  Chess chess = new Chess();
  while (!chess.game_over) {
    print('position: ' + chess.fen);
    var moves = chess.moves();
    var move = moves[0];
    print('move: ' + move);

Documentation #

The chess.js documentation is largely relevant, but there are also DartDocs generated within the lib/docs directory. The only change in naming from chess.js, is that history() has been changed to getHistory() due to a conflict with the history ivar and some methods have been changed into properties.

The test directory contains tests.dart which is a port of chess.js's unit tests. The program random.dart plays a random game of chess. ai.dart is an example of a simple 4 ply alpha beta search for black (yes a simple chess-playing program) that uses a purely material evaluation function (it is rather slow).

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  chess: ^0.6.5

2. Install it

You can install packages from the command line:

with pub:

$ pub get

with Flutter:

$ flutter pub get

Alternatively, your editor might support pub get or flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:chess/chess.dart';
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Learn more about scoring.

We analyzed this package on Feb 13, 2020, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.7.1
  • pana: 0.13.5

Health suggestions

Fix lib/chess.dart. (-25 points)

Analysis of lib/chess.dart reported 86 hints, including:

line 28 col 53: Avoid const keyword.

line 41 col 40: Avoid const keyword.

line 43 col 48: Avoid const keyword.

line 44 col 12: Avoid const keyword.

line 45 col 12: Avoid const keyword.

Maintenance issues and suggestions

Provide a file named (-20 points)

Changelog entries help developers follow the progress of your package. See the example generated by stagehand.

Package is getting outdated. (-44.38 points)

The package was last published 75 weeks ago.

Maintain an example. (-10 points)

Create a short demo in the example/ directory to show how to use this package.

Common filename patterns include main.dart, example.dart, and chess.dart. Packages with multiple examples should provide example/

For more information see the pub package layout conventions.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.0.0 <3.0.0
Dev dependencies
benchmark_harness >=1.0.0 <1.1.0
test >=1.2.0 <2.0.0