fritz is a german chess program by frans morsch and mathias feist, published by chessbase. it is the current market leader. there is also a different kind of fritz called "deep fritz" that is made for multi-processing. the latest kinds of the consumer products are deep fritz 12 and fritz 12. they came with reviews by josh waitzkin, who said that "fritz is like a woman that you can't get with. it just drives (makes) you to think in ways you've never thought before".