Chess

From Applepedia

Chess is a chess client that comes with Mac OS X, featuring a very high quality graphical display and support for chess variants such as crazyhouse and suicide chess. The source code is available from Apple's web site.

The Apple Chess front end is a Cocoa application whose drawing code is based on the glChess OpenGL chess client. It communicates with the Sjeng chess engine which runs in a separate process.

You can change the style of the board, pieces, and even rotate the board around. Supposedly you can speak moves with a microphone, but it didn't work for me.