Author: Robert Hyatt
Date: 13:35:34 08/01/04
Go up one level in this thread
On July 31, 2004 at 23:14:28, Bruce Humphrey wrote: >On July 31, 2004 at 16:53:46, Eduard Nemeth wrote: > >>Question: >> >>Shredder 8 have 2818 SSDF Elo on AMD 1,2 GHz, right? Yes! >> >>Which SSDF-ELO have then Shredder 8 on Dual Xeon 3 GHz? >> >>2900? Or more? >> >>:-)) >> >>Eduard > >Yes, a 2900 that is blind to the fact that a rook locked in by pawns is worth 0 >(or maybe 1) and not 4.88 at depth 24 (I'm sure during the game my Shredder was >evaluating 4.6...) as Shredder evaluates in end position in game 1. Well, other >software gives even bigger advantage to white! > >During the game I thought black was going to win the moment Kiriakov plays b5... >he did mention just the move before "b5 only plan. White can block with Rb5 and >obvious draw", but Shredder is blind to the fact that yes, it wins 1 pawn but in >exchange of losing his rooks mobility. The position is really complicated around >move 82... what pawn does black take, central or h (via Nf2+-Nxh3)? How does >this affect everything? Well, humans (and even more at 6am local time in >Krasnoyarsk and with not much time left) tend to have trouble in the >complications. A wonderful draw by GM Kiriakov. This makes it (as far as I know) >Shredder 8 vs Kiriakov +0-0=4 > >I'm counting Smursky's games too... all 4 games vs dual or better machines. > >Maybe next one to try should use Tiger or Hiarcs. Or even Gambit Tiger or Junior >set in Attack mode. I personally would love it to be Rebel 12. :-) > >Here is the position tested in various programs... Very curious is the eval >difference between hiarcs 9 for PC and Hiarcs 9.46 for Palm!!! I thought they >where almost exactly the same, but obviously, 9.46 has been tweaked a lot (in >knowledge ?). That, usually, should be for good, but it seems not for this >position... > >comp depth eval >-------- ----------- ------ >Fritz 8 depth 20/20 4.38 >Ruffian ca71 depth 18 4.67 >Shredder 8 depth 25 4.89 >Rebel 12 depth 20 4.97 >wCrafty 19 ca71 depth 18 5.08 >Gothmog 1 beta7 depth 17 5.40 >Genius 7 depth 17-28 5.51 >Hiarcs 9 depth 16/33 5.99 !! >Dragon ca71 depth 12 6.02 >Crafty 19.14 cb depth 18/25 6.38 >Junior 8 depth 24 6.39 >Tiger 15 ca71 depth 20 6.52 >Tiger 14 cb depth 17 6.73 >Hiarcs 9.46 depth 15 7.69 !! (353sec taken) the data above is flawed in a basic way. The absolute value of any score is not important. IE I could do a "score = score - 500" in Crafty, and it would play _exactly_ the same but with a score that is 5 pawns less than expected. It is a mistake to compare evaluations. What is comparable is to pick position X, and see what a program thinks, and then position Y and see what it thinks, and look at the _difference_ between those to scores as the net gain when going from X to Y. That is what contains actual information, not the static absolute score.
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