Originally posted by Tyrannosauruschex
I am sure there would be plenty of humans that could draw with it and keep its rating down low. Most strong engines are around 3000 now, so it is easier for one to have a good string of results and climb up that little bit higher.
From wikipedia about an earlier version of rybka which would have been lees powerful than the rybka rated under 3000 on ssdf:
"Whilst Rybka has won a match with GM Jaan Ehlvest which involved giving a pawn odd to the human, IM Larry Kaufman of the Rybka team has pledged his own money to a human GM that can beat Rybka in a six-game match without material odds. GM Jaan Ehlvest was again chosen to play Rybka, getting twice the thinking time and white every match, with Rybka having only a three-move opening book, limited (512MB) hash size, and no endgame tablebases (the match being dubbed "Everything but a pawn"
. The match ended 4.5-1.5 after three Rybka wins and three draws.
Rybka later played an eight-game match against GM Roman Dzindzichashvili with pawn and move odds, from March 3 to March 8. The result was 4-4, after two Rybka wins, 4 draws and 2 losses."