Natwarlal Chess 0.14 is an interesting and completely free chess game, which lets you, with some options, make the games more interesting. For example you can make a move and then go back and try again (something you can`t do normally, and the program won`t get angry with you).
Also, if you have doubts about which move to make, you can ask for a clue from the program. It includes chess boards and the option to save games.