Very fast Chess game designed to run on a small server and play hundreds of concurrent games. GUI is only HTML5 and JavaScript.

• Allows to play with a friend, a random player or an artificial intelligence.
• Supports castling, en passant, selective promotion, color selection, check and mate detection, threefold repetition, and move validation.
• Chess clock, integrated chat, real time spectator mode and analysis interface available.
• Chess variants available: Standard and Chess960
• Translated to more than 48 languages thanks to contributors.
• Uses only open source languages: PHP 5.3, HTML5, Javascript and CSS. Powered by Symfony2, jQuery 1.5 and jQuery UI 1.8.

• Play Chess with a random player
• Play Chess with a friend
• Play Chess with the computer
• Real time list of games beeing played
• List of all games
• List of all players
• Game analysis

I'm eagerly waiting for bug reports and feature requests in Lichess Forum

Lichess is built on Symfony2, which is under heavy development at the moment.

It requires APC. It's a free and open opcode cache for PHP.

It uses MongoDB for game storage.

git clone git://github.com/ornicar/lichess.git
cd lichess
./bin/vendors install

Open your browser at http://myhostname/check.php

You can also run checks from command line, but the results may differ:

php web/check.php

By running this script:

./bin/reload

It will build the bootstrap, clear the cache, warm it up, load fixtures, create MongoDB indexes and symlink assets.

You can run this script as many times as needed. Note that it reinitializes the dev and test databases.

Open your browser at http://myhostname/index_dev.php

The default AI is crafty, an opensource program written in C.

sudo apt-get install crafty

If you can't or don't want to install crafty, you can disable it:

# lichess/config/config.yml
lichess:
    ai:
        crafty:
            enabled: false
            priority: 2
            executable_path: /usr/bin/crafty
            book_dir: /usr/share/crafty
        stupid:
            enabled: true
            priority: 1

Lichess will then use the next AI available, called "stupid". It's dumb as hell but it plays :)

If you get cache slam warning in logs, upgrade APC and/or disable the warnings in apc.ini

apc.slam_defense="Off"

Lichess is well tested. You should run the tests if you plan to modify the code.

You need PHPUnit 3.5 installed.

Run all unit and functional tests

phpunit -c app

To get functional tests passing, you need to enable APC in CLI.

# /etc/php5/cli/conf.d/apc.ini
extension=apc.so
apc.enabled=1  
apc.enable_cli=1
apc.shm_segments=1  
apc.shm_size=64