A free program for Android, by Games By Post.

Chess By Post is a classic multiplayer chess game. Challenge your friends or play with people around the world. You can also play with random opponents of similar skill levels.

The game is played on a board with 64 squares arranged in an 8×8 grid.  The goal of the game is to capture the king by using any moves possible.

You can learn the best moves and see your move strength rating. Chest Post improves your skills by showing variations to your moves to improve your chess skills. 

You can play offline with computers for practice or test your skills online with people. Test your brain with this amazing simple game.