i have been testing zappa mexico for 3 days now,40/20,40/20,20. quad q6600 2.4 against rybka 2.3.2a.32 bit.hs master book,12 moves,result so far,15.5-12.5 to zappa,on eco c98 zappa won both,127 moves as black,65 moves as white.this a very strong prog.not just geared for rybka,it is also beating hiarcs 4 core as well,but not many games