Chess Plus+ is an enhanced computer chess game powered by a sophisticated artificial intelligence engine resulting in automated opponent player ratings ranging from Novice to Grandmaster! With Chess Plus+ you will engage in challenging computer player chess games whether you're just starting out or an old pro! Algorithmically varied computer opponent gameplay simulates real-world match conditions. Includes 4 chess ebooks built-in for offline reading on chess Fundamentals, Strategy, Game Play, and Openings. FEATURES: ? Computer Player Grandmaster ELO of 3450+ ? Castling, Promotion, and En Passant ? Save Game Moves to File ? Dual Player Time Clocks ? Invert Pieces Feature ? Play Black or White ? 4 Modes of Play ? Scrollable Moves List ? 4 Chess eBooks Included ? Move Count, Status, and Turn Displays ? 10 Computer Player Levels ? Resizable App Window ? Includes Chess Rules ? And more! Mac OS Compatibility: All machines running OS X 10.7 and above.