You can use these pieces for propagation or to create a custom game.
Dear Player,
This software was originally intended to generate Fisher Random chess games. It has got some new features, though, most notably the possibility to play online. Please note, that this is a very unstable feature, and it may (it should) be prone of serious security flaws. Therefore please only play with people you trust, because even though I made some precautions, this doesn't mean that you shouldn't.
2012-02-06 Added some validation to filter some (not all!) invalid moves. The code might be bogus, please tell me if it is.