A very good Chess game.
User Rating: 9.1 | Chessmaster 10th Edition PC
If you want to play chess against a computer and improve your skill, buy this. It has a learning mode, a mode where you get ranked on how good you are, and a mode just for fun. What makes this game even better is that there are about a hundred different people to play against, all of which have unique styles. It has 2 or 3 Dimensional pieces for you to play with. I think this is a lot better than playing on a board. The game cheats sometimes ( A pawn moved forward and took a Bishop that was diagonal to it before it moved in one turn) but you can adjourn games and your rank won't go down. The game also includes a tournament mode in which you can play against people over the internet or agaist the people the game has. 
