Chess Assistant 16 PRO The top chess program used by chess grandmasters worldwide Includes top engine Houdini 4 Pro, rated above 3400 ELO Number of Installs: Up to 4 Computers (can activate Houdini 4 Pro 4 times) Software is Windows 10 Compatible: Yes System Requirements: 256 RAM, 4 Gb, Windows XP/Vista/7/8/10, DVD-ROM