*Premium membership at Playchess.com for 6 months    * 64 Bit Multiprocessorversion    *ChessBase Engine Cloud    *Let's Check function       Minimum: Pentium III 1 GHz, 2 GB RAM, Windows XP (Service Pack 3), DirectX9 graphics card with 256 MB RAM, DVD-ROM drive, Windows Media Player 9 and Internet access to activate the program, Playchess.com, Let's Check, Engine Cloud and updates.Recommended: PC Intel Core i7, 2.8 GHz, 4 GB RAM, Windows 7 (64 Bit) or Windows 8 (64 Bit), DirectX10 graphics card (or compatible) with 512 MB RAM or more, 100% DirectX10 compatible sound card, Windows Media Player 11, DVD ROM drive and Internet access to activate the program, Playchess.com, Let's Check, Engine Cloud and updates.