Author: Sune Fischer
Date: 04:37:35 09/07/04
Go up one level in this thread
On September 07, 2004 at 07:13:43, Reinhard Scharnagl wrote: >On September 07, 2004 at 04:50:35, Sune Fischer wrote: > >>On September 06, 2004 at 07:43:51, Peter Fendrich wrote: >> >>>What free programs have the fastest perft and what are the figures? >>>Please, If you give figures also add processor, compiler and environment! >> >>Frenzee does perft 7 on the initial position in 28 seconds on my 2 GHz Athlon. >> >>However that is using hash and "the Uri trick" with no make/unmake at the last >>ply. >> >>>I want to compare with a new concept that isn't coded yet... >> >>Just realize that this is really comparing apples to oranges. >> >>I tried using the above fully legal generator in the program as >>opposed to the old incremental generator, but all I saw was a big slowdown. >>I don't recall the exact number but I believe it was around 10-15% slower than >>the incremental approach. > >>My conclusion is that at least for the frontier nodes a fully legal move >>generation is not worth it, at least not for a bitboarder that can easily do a >>much faster incremental pseudo generation. > >Hi Sune, > >last statement could been proved easyly by perft or it is simply an opinion. Hmm, how do you test this in perft? A long move list takes longer to generate and it takes longer to sort it. That would be double penalty in a real program but in perft there is no overhead in working on a long movelist since you'll be needing all the moves anyway. I don't see how to "fix" this in perft to make it a good test, do you randomly start throwing moves away to simulate beta cuts? :) I think it is far better to implement both and test it in a real program, that's a bit extra work perhaps but it's also a no nonsense direct test. >My opinion is, that bitboarders neither are really faster nor slower. Yeah hard to say, it's not easy to construct a valid test. -S.
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