Company Ted Wong created these great apps:
SmallChess Pro, SmallFish Chess For iOS 6 - Free & Friends, Chess Mini, SmallChess, SmallFish Chess for Stockfish, Free Chess App - Play & Learn & Coach, Echesspedia - Learn Chess Opening Theory, Encyclopedia of Opening, Rook Endgame for Syzygy 6, Mega - Encyclopedia of Opening, Chess Tablebase for Stockfish, Queen Endgame for Syzygy 6, Bishop Endgame for Syzygy 6, Knight Endgame for Syzygy 6, Pawn Endgame for Syzygy 6, and others..