Author: Chessfun
Date: 22:21:58 09/14/02
Go up one level in this thread
On September 15, 2002 at 00:19:20, John Merlino wrote: >On September 14, 2002 at 17:14:41, Kurt Utzinger wrote: > >>Zugeordnete Felder 1.g4 - Cheron 0724 >>[D]8/8/K6p/6p1/8/8/k5PP/8 w - - 0 1 >> >>In this position the old TheKing 3.12d under Fritz7-GUI finds the winning move >>1.g4 within 7s. CM9 with the same amount of hashtables (32 MB) needs 3m7s, but >>CM9 with only 4 MB hashtables is the fastest with 3s. A real mystery for me, all >>on P4 1800/512. >> >>Analysis by The King 3.12d: Fritz7-GUI (32 MB hash) >> >>1.Kb5 Kb2 2.Kc5 Kc2 3.Kd5 Kd2 4.Ke5 Ke2 5.Kf6 g4 6.Kf5 g3 7.hxg3 Kf2 8.g4 Kg3 >>9.Ke4 Kxg2 10.Kf5 Kf3 >> = (0.13) Depth: 3 00:00:00 >> = (0.09) Depth: 20 00:00:04 1512kN >>1.g4 Kb2 2.Kb6 Kb3 3.Kb5 Kc3 4.Kc5 Kd3 5.Kd5 Ke3 6.Ke5 Kf2 7.Kf6 Kf3 8.Kf5 Ke3 >>9.h3 Kd4 10.Kg6 Ke5 11.Kxh6 Kf6 12.Kh5 Kg7 13.Kxg5 >> +- (1.47) Depth: 20 00:00:07 2232kN >> +- (4.49) Depth: 24 00:02:49 41876kN >> >>(Utzinger, MyTown 14.09.2002) >>******************************************************************************** >>TheKing 3.23 (CM9 GUI) 32 MB hash >> >>Time Depth Score Positions Moves >>0:04 17/21 0.08 1772968 1.Kb5 Kb2 2.Kc5 Kc2 3.Kd5 Kd2 4.Ke5 >> Ke2 5.Kf6 g4 6.Kf5 g3 7.hxg3 Kf2 >> 8.Kf4 Kxg2 9.g4 Kf2 10.Ke4 Kg2 >> 11.Kf5 Kf3 >>0:09 18/22 0.08 2783014 1.Kb5 Kb2 2.Kc5 Kc2 3.Kd5 Kd2 4.Ke5 >> Ke2 5.Kf6 g4 6.Kf5 g3 7.hxg3 Kf2 >> 8.Kf4 Kxg2 9.g4 Kf2 10.Ke4 Kg2 >> 11.Kf5 Kf3 >>3:07 18/22 2.19 39768632 1.g4 Kb3 2.Kb5 Kc3 3.Kc5 Kd3 4.Kd5 >> Ke3 5.Ke5 Kf2 6.Kf6 Kf3 7.Kf5 Kg2 >> 8.Kg6 Kf3 9.h3 Kg3 10.Kxh6 Kh4 >> 11.Kg6 Kxh3 12.Kxg5 >>---- ---- ---- ---- ---- >>******************************************************************************** >>TheKing 3.23 (CM9 GUI) 4 MB hash >> >>Time Depth Score Positions Moves >>0:00 12/16 0.10 249552 1.Kb5 Kb3 2.g4 Kc3 3.Kc5 Kd3 4.Kd5 >> Ke3 5.Ke5 Kf3 6.Kf5 Kg2 7.Kg6 Kh3 >> 8.Kh5 Kxh2 9.Kxh6 >>0:00 13/17 0.10 350152 1.Kb5 Kb3 2.g4 Kc3 3.Kc5 Kd3 4.Kd5 >> Ke3 5.Ke5 Kf3 6.Kf5 Kg2 7.Kg6 Kh3 >> 8.Kh5 Kxh2 9.Kxh6 >>0:01 14/18 0.31 587468 1.Kb5 Kb2 2.Kc5 Kc2 3.Kd5 Kd2 4.Ke5 >> Ke2 5.Kf6 g4 6.Kf5 g3 7.hxg3 Kf2 >> 8.g4 Kxg2 9.Kf4 Kh3 >>0:03 14/18 1.51 960806 1.g4 Kb3 2.Kb5 Kc3 3.Kc5 Kd3 4.Kd5 >> Ke3 5.Ke5 Kf3 6.Kf5 Kg2 7.Kg6 Kf3 >> 8.h3 Ke4 9.Kxh6 Kf4 10.Kg6 >>0:04 15/19 1.49 1158272 1.g4 Kb3 2.Kb5 Kc3 3.Kc5 Kd3 4.Kd5 >> Ke3 5.Ke5 Kf2 6.Kf6 Ke3 7.Kg6 Kf4 >> 8.h3 Ke5 9.Kxh6 Kf6 10.Kh5 >>0:47 16/20 2.19 9617559 1.g4 Kb3 2.Kb5 Kc3 3.Kc5 Kd3 4.Kd5 >> Ke3 5.Ke5 Kf2 6.Kf6 Ke3 7.Kg6 Kf4 >> 8.h3 Kg3 9.Kxh6 Kh4 10.Kg6 Kxh3 >> 11.Kxg5 >>0:51 17/21 2.19 10532568 1.g4 Kb3 2.Kb5 Kc3 3.Kc5 Kd3 4.Kd5 >> Ke3 5.Ke5 Kf2 6.Kf6 Ke3 7.Kg6 Kf4 >> 8.h3 Kg3 9.Kxh6 Kh4 10.Kg6 Kxh3 >> 11.Kxg5 >>1:15 18/22 3.48 15574649 1.g4 Kb3 2.Kb5 Kc3 3.Kc5 Kd3 4.Kd5 >> Ke3 5.Ke5 Kf2 6.Kf6 Ke3 7.Kg6 Kf4 >> 8.h3 Ke5 9.Kg7 Ke6 10.Kxh6 Kf6 >> 11.Kh5 Kg7 12.Kxg5 >>1:17 19/23 3.48 16035289 1.g4 Kb3 2.Kb5 Kc3 3.Kc5 Kd3 4.Kd5 >> Ke3 5.Ke5 Kf2 6.Kf6 Ke3 7.Kg6 Kf4 >> 8.h3 Ke5 9.Kg7 Ke6 10.Kxh6 Kf6 >> 11.Kh5 Kg7 12.Kxg5 >>1:20 20/24 3.81 16776827 1.g4 Kb3 2.Kb5 Kc3 3.Kc5 Kd3 4.Kd5 >> Ke3 5.Ke5 Kf2 6.Kf6 Ke3 7.Kg6 Kf4 >> 8.h3 Ke5 9.Kxh6 Kf6 10.Kh5 Kg7 >> 11.Kxg5 Kf7 12.h4 Kg7 13.Kf5 >>******************************************************************************** > >Johan was gracious enough to answer my e-mail on a Saturday (although it was >probably very early on a Sunday for him!). Here is what he said: > >-------------- >Basically, the shape of the search tree (hence the size) depends very much on >"luck". Different programs, different versions, and different settings (even the >hash table size or k-best mode) may change the "solution time" by a factor 10 or >100 easily. > >Chess programmers are of course not very happy with this behaviour, but the >average performance (ie scoring points) always goes first. In other words, >theoretical correctness is always sacrificed in favor of average program speed >and development time, with every programmer using his favourite trick(s) to keep >the damage small. Another example of the luck factor can be observed in the >thread CCC:251808. Does the last statement mean that Johan reads CCC? Anyway I don't see the two positions as related but who knows. Or did you yourself also send him that position as an example as you never posted in the thread? Sarah.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.