I assume you're the creator of this app, if you want to really grab attention of the mac audience I suggest you program a game analyzer in.
Macs are dreadful when it comes to finding a good chess program with the ability to analyse games, and im sure many people, myself included would be thrilled to have a proficient one.
New Chess App for Mac OSX


Chess engines aren't a problem on mac's. Stockfish, Critter and Komodo all have native mac support. The real issue is a good engine GUI like Arena and a full featured database.
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!
Computer Player AI Grandmaster Level ELO of 2850+
Includes 4 chess ebooks built-in for offline reading on chess Fundamentals, Strategy, Game Play, and Openings.
With Chess Plus+ you will engage in challenging 1 or 2 player chess games whether you're just starting out or an old pro! Algorithmically varied computer opponent game play simulates real-world match conditions.
FEATURES
Castling, Promotion, and En Passant • Play Black or White • Dual Player Time Clocks • 4 Modes of Play • Scrollable Moves List • Advanced Artificial Intelligence • 4 Chess eBooks Included • Move Count, Status, and Turn Displays • Multiple Computer Player Levels • Includes Chess Rules • And more!
Details: https://itunes.apple.com/us/app/chess-plus+/id586035238?ls=1&mt=12