I'm the author of the "Chess Tiger" chess engine.

I have produced commercial versions of this engine for DOS, Windows, PalmOS and iOS, and private versions for Linux and MacOS.

I wanted to do research in AI, but ended up creating a very sophisticated calculator instead (that's what current top chess programs are unfortunately).

But I don't feel too bad: people use my products to teach chess to their kids, and it works!

So it's fine after all...