DeepGreen

Quote from the dev:
"The first full-featured Chess playing application for the Newton. Deep Green is a joint effort between Scott Ludwig, who ported an existing Unix chess engine to his PocketChess for the PalmPilot, and Jens Bengaard, who ported Scott's chess engine to the Newton using Apple's C++ toolkit for Newton, and myself, who designed and coded the user interface in NewtonScript.
I've put a great effort into making Deep Green as pleasant a user experience as possible. I hope you'll enjoy playing chess with your Newton using Deep Green. Please mail me any suggestions, bug reports or whatever you feel like. I'd like to hear what you think...".