Author: Sune Fischer
Date: 12:25:34 07/17/02
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On July 17, 2002 at 14:32:11, Dann Corbit wrote: >On July 17, 2002 at 14:13:57, Sune Fischer wrote: >[snip] >>I would love to see a G/5 rating list compared to a G/120 list, I think most >>good engines does about equally well in all time controls. > >This is a common contention. I have heard it said by such experts as Christophe >Theron and Gian-Carlo Pascutto. However, it is clearly and transparently wrong. > >Assertion: >No two chess programs with non-identical search and evaluation have *exactly* >the same branching factor. > >If this assertion is true, then it is transparently false that chess programs >play with the same level of excellence at all time controls. > >Or, stated another way, for every chess program, at *some* point, the branching >factor of that program will totally dominate the play of the program. > >Draw a curve of: > >C0 * exp( C1 * x) >verses >C2 * exp( C3 * x) > >and as long as constants C1 and c3 are not identical, at some point the equation >with the smaller constant in the exponent will dominate. If (by chance) C0 or >C2 is also smaller for the smaller exponent modification, it is possible that >one program will always be better everywhere [within reason]. > >However, the assertion that the entire family of curves never have intersections >is [with no doubt whatsoever] utterly false. Yes I know the math (I've posted it myself:). The point is, can you give examples where program X is better at blitz and program Y better at standard time (on ~1GHz)? I rarely see these lines cross, and if they do it is probably only between very equal opponents or weak engines that have bad tuning. IIRC people on this board have refuted the notion, that Hiarcs should be a bad blitzer just because it is a slow searcher, for instance. I prefer to play around 50-100 games to see if the changes were for the better or worse, this would take weeks if I had to play at standard time. I doubt there is any significant difference (other than a lot of wasted time). -S.
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