CHESS PROBLEMS - NO INTERNET CONNECTION REQUIRED! - 40 chess problems (40 chess diagrams) to keep your brain fit for any challenge. 40 chess problems without the need of a chess board to bild up chess positions. You have a list of 40 chess problems, each of which is represented with a diagram. You can analyse the position and when you want to check if you have found the right move, just touch the diagram and the solution, (chess diagram) will appear on the screen, followed by the different variants, each one with its own diagram, according to the black's answer. Occupying yourself with these brain exercises is healthy enjoyment. Each time that you find the right move you will be proud of yourself!!!