World Championship Winning Computer Chess Software Program & Downloads for Chess Databases, Analysis and Play on PC, Mac, iPad and iPhone — Visit: Hiarcs.com
Naum?
Naum - Hiarcs 16.5:15.5, older post here. If Zappa-Hiarcs 20.5:11.5, probably Naum very little chance from Zappa.
Shredder 11?
Buy 11/2007, test later.
Currently: Loop M1-P - Zappa Mexico/64 3.0:6.0 (0:3=6), 23 games to go.