The coach can warn you when you blunder. You can also find out what the best move is. You can set the playing style of the computer (agressive, passive, solid, active, normal or random). You can exactly set the elo strength of the computer, 1555 for instance (2600 is the max). The CPU strength can be adjusted automatically after each game, to match your strength. You can turn off ratings (for matches and puzzles). The evalution of the position can be shown, so you can see if your move is improving your chances of victory. So a very useful app to improve your game.
Talking Ginger 2Gratis!