Hans Ree writes about the Ehlvest - Rybka match on ChessCafe.com:

"From now on the Rybka people can claim that their program can give pawn odds to a former world championship candidate and win convincingly. I don't think Rybka would be able to do it under fairer conditions: a match in which it would have white and black alternately, with classical time control and against an opponent who is well prepared for the unusual circumstances."

The Advantage of Giving Odds