Thanks Robotvinnik, but StockFish on the iPhone doesn't keep the variations either. It only keeps the main line.
Best iPhone apps for chess players
Sort:
A tablet or phone should be fun to use. The best simple chess clock for Android is Chess Cloid by Fireworks. The best simple chess clock for Iphone/Ipad is Game Timer by Thana! They are free! I hope you find them very useful!
Try Stockfish, very strong and free!!
http://www.stockfishchess.com/
http://itunes.apple.com/gb/app/stockfish-chess/id305558605?mt=8