Tobi has released a great looking Chess game for the Nintendo DS, heres the info:
This is a chess game for the Nintendo DS. It builds upon a very strong open source chess engine called Fruit 2.1 by Fabien Letouzey (now commercial: www.fruitchess.com). The engine was changed to meet the requirements of the DS.
The interface is quite simple but functional. Here are some features:
Touchscreen support
Opening book
Undo moves
Different time options or fixed calculation depth
Force the computer to make a move
There are many things, that need to improve. Besides (I hope not so many) bugs, there are some known problems:
Pawn promotion (it will automatically promote to a queen)
Menu issues