TalkChess.com

[Uri Blass]

Sorry but something that is 41 elo weaker than houdini2c based on your result cannot be clearly number 2 and I see that you test 1 cpu 64 bits(maybe it is less than 41 elo weaker but you have not enough games to know).

From the CEGT rating list
http://www.husvankempen.de/nunn/40_40%20Rating%20List/40_40%20All%20Versions/rangliste.html

17 Houdini 1.5a x64 1CPU 3013 14 14
19 Houdini 2.0c x64 1CPU 3002 15 15
27 Critter 1.6 x64 1CPU 2989 15 15
30 Komodo 4.0 x64 1CPU 2981 13 13
35 Stockfish 2.2.2 x64 1CPU 2973 17 17
Houdini1.5a that seems to be the strongest houdini for 1 cpu and not the houdini2c is only 24 elo better than Critter and 32 elo better than Komodo and 40 elo better than Stockfish.

Houdini is only slightly better than Critter Komodo and Stockfish(excpet very fast time control that is not interesting) and you need at least 1000 games at 40/20 to be convinced that houdini is stronger than Critter when we talk about houdini1.5a and for houdini2c it seems that 1000 games are not enough to be convinced that it is stronger than Critter(there is a possible error of 15 elo when the difference between houdini2 and Critter1.6 is only 13 elo).

If you want to be sure that something is stronger than Critter and weaker than houdini at 40/20 CEGT time control then you probably need many thousands of games.