Does anyone know of a chess game on the Nintendo DS which…

…has a varation board?

By "variation board", I mean a board on which you can play out alternate lines of play. For example, if you're reading through a book like Understanding Chess Move by Move and you're not able to play out a variation in your mind, you can use a variation board.

Chess interfaces on the PC (like Fritz) have this, of course, but it's a pain for me to have to turn on the computer every time I want to do this. I'd rather have this ability on my DS.

I currently use Chessmaster DS to play out moves when I'm reading books, using the 'position setup' screen, but unforunately Chessmaster DS doesn't have the ability to undo moves, and therefore playing out variations isn't always easy.

I see that Fritz Chess is coming out soon on the DS, but does anyone know whether it has a variation board?

Thanks

how about chess.com for DS