The chess games can't be entered in CMSimple_XH's back-end; instead they have to be imported from PGN files.
The plugin requires an UTF-8 encoded CMSimple_XH installation and PHP ≥ 5.2. It is released under GPLv3.
Chess_XH couldn't be tested so far in various environments. It is a so called beta version. Use with caution!
There is an online demo available. The changes are listed in the changelog. For further details you can read the manual online.