Aus einem interressanten Interview mit P.Svidler:

ChemaAnton: Hello, Peter! Which engine do you use for analysis? (if it's not a secret).
Тактик: Which chess programs do you prefer - which engines do you use?

I've put together quite a large collection - although I've also seen much more complete menageries than mine. At the moment the ones I use most are Houdini, Fire and Rybka.

Нарицатель: What's your opinion on "Rybka"? Do you think the strongest chess programs have already passed the point at which winning even one game (without a handicap!) against them over any sort of reasonable run of games is impractical for a flesh-and-blood player?

One game isn't the long run. Winning a match is, to put it mildly, extremely unlikely, but winning one game over the course of a long match is still possible, I think, although extremely tough. A lot, again, depends on the equipment - your average run-of-the-mill notebook is one thing, while 8172 parallel processors is something else entirely

Hier das ganze Interview
http://www.crestbook.com/en/node/1390