Red Hot Pawn has been created by the authors of Rival Chess which can be downloaded from the links on this page. Rival Chess is a standalone program and is not required to use the online chess features of RedHotPawn.
The current Java UCI version of the Rival engine, as used in the Android App is available for download at RivalChess.com
Previous C++ Rival UCI engine (2006)
The UCI version of Rival can be used as an engine in UCI-compatible GUIs such as Fritz and Arena. The UCI version does not include an opening library (please use the opening book features of the GUI within which it is running).