Great App W/Bug
Excellent aid in sharpening the weak points in your chess skills, as well as, an excellent guide for beginners!
However, (& this is the only negative) there is a bug in the 3rd set that causes an error when checkmate is executed, stating the move not a checkmate and moving multiple pieces that have no bearing what-so-ever on the checkmate. Even use of the Hint declares exact execution, yet continues to state the move to be invalid.
Still an all around, excellent app, and I am still enjoying it!
B.FisherImNot about
Mate in One Move. Chess Puzzle