The Chess King installer will install a 32-bit version of Houdini 2 if the computer is based on a 32-bit operating system, and a 64-bit version of Houdini, if the operating system is 64-bit. In other words, you’re always sure to have the maximum power adapted to your computer with Chess King or Chess King Pro. We also guarantee the most recent versions of Houdini 2 for Chess King and Houdini 2 Pro, via auto-update.