The game engine is a major improvement of the game engine of the original Java applet, in a number of ways:
I let WinThello play against well known Othello programs like Forest, WZebra and some other Windows-based Othello games. It turns out that WinThello doesn't play that bad at all!!
I didn't perform a thorough comparison test, so I'm interested in your feedback.
Download the game by clicking the icon below. Its size is 421K.