Chess By Blog Plugin for WordPress

Chess By Blog is a plugin for WordPress that — surprise — adds a number of chess-related features to WordPress. According to the developer’s list of features, that includes,

• PGN (Portable Game Notation) inserted into your post body will be displayed as a graphical board, inline in the browser. The client side code was written using the Google Web Toolkit (GWT), resulting in Javascript (no Java required) that has been tested in Internet Explorer 6 and 7, Mozilla/Firefox, and Safari. The graphical look of the chessboard is controlled by themes, and can be easily controlled in the management panel for the plugin.
• The board supports interactive play directly in the browser, in a mode which does not update the post body. All rules of chess are supported, include en passant, castling, and pawn promotion. This can be used to present chess problems for readers to work through.
• Chess By Blog also supports a persistent game played between two players, hence the name of the plugin. Readers that have edit permissions on a post can take turns moving pieces, with the state of the board saving to the WordPress database between moves. The plugin uses WordPress and PHP security features to ensure that only moves that come from the client chessboard code can update the database.

The plugin is regularly updated and the developer notes it has been tested and works with WordPress 2.6.