One of my hobbies is chess programming. I'm the developer of two chess engines:

Stobor is my main focus. I've been working on it (off and on) since 1993. It's designed to be as good at chess as possible.

TSCP (Tom Kerrigan's Simple Chess Program) is a small, open-source chess engine that I made in 1997. It's a tutorial engine, i.e., it's designed to teach people how chess engines work.

tChess is an iOS app that I've been working on (and selling) since 2008. It uses Stobor.