What is the effective speedup for Rybka 3 when running on a multi-processor platform?
We’ll post these figures as soon as they are available. If Rybka 2.3.2a searches for 3 minutes and reports a depth of 19, while Rybka 3 searches for 3 minutes and reports a depth of 18, does this mean that Rybka 2.3.2a has looked into the position to a greater depth, and therefore must be “seeing” more by looking deeper (even though the breadth may be lesser)? No, not at all. The depth is just a number Rybka uses to keep track of her search. It does not indicate any breadth vs depth tradeoff or anything else which might be meaningful to the user. All you can say is that depth X+1 for Rybka 3 is deeper than depth X for Rybka 3.
