Author: Kurt Utzinger
Date: 12:45:05 10/12/02
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This behaviour has also been discussed earlier. Below a copy: Is the new Chessmaster 9000 (TheKing 3.23) running better under Fritz7-GUI? I am somewhat puzzled but this may be true. When testing the position [D]8/8/K6p/6p1/8/8/k5PP/8 w - - 0 1 I got different and partly worse results under CM9-GUI whereas under Fritz7-GUI using Wb2Uci.eng and Wb2Uci.exe the test can be repeated with still the same solution time and evaluation. What's your experience? John Merlino and Johan de Koning tried to give an answer. But I am almost sure that something must be wrong with CM9 as it can be seen from the examples below with different sizes of transposition tables, ponder=off, P4 1800/512 ******************************************************************************************** On September 14, 2002 at 17:18:40, John Merlino wrote: I have confirmed this behavior on my PIII-733. I will contact Johan and ask him about this, but I may not have an answer for you before Tuesday. jm ******************************************************************************************** Posted by John Merlino (Profile) on September 15, 2002 at 00:19:20: In Reply to: CM9 mystery? posted by Kurt Utzinger on September 14, 2002 at 17:14:41: 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. ******************************************************************************************** TheKing 3.13 with no transpositon tables (P3 1800/512) Time Depth Score Positions Moves 0:00 8/12 0.15 125198 1.Kb5 Kb3 2.g4 Kc3 3.Kc5 Kd3 4.Kd5 Ke3 5.h3 Kd3 6.Ke5 Ke3 0:00 9/13 0.12 290429 1.Kb5 Kb3 2.g4 Kc3 3.Kc5 Kd3 4.Kd5 Kc3 5.Ke5 Kd3 6.h3 Ke3 7.Kd5 0:01 10/14 0.15 626952 1.Kb5 Kb3 2.g4 Kc3 3.Kc5 Kd3 4.Kd5 Kc3 5.Ke5 Kd3 6.h3 Ke3 7.Kd5 Kd3 0:03 11/15 0.00 1545535 1.Kb5 Kb3 2.g4 Kc3 3.Kc5 Kd3 4.Kd5 Ke3 5.Ke5 Kf2 6.Kf5 Ke3 7.Ke5 0:09 12/16 0.10 4283296 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 0:24 13/17 0.00 11664030 1.Kb5 Kb3 2.g4 Kc3 3.Kc5 Kd3 4.Kd5 Ke3 5.Ke5 Kf2 6.Kf6 Kf3 7.Kf5 Ke3 8.Ke5 1:05 14/18 0.10 30889552 1.Kb5 Kb3 2.g4 Kc3 3.Kc5 Kd3 4.Kd5 Ke3 5.Ke5 Kf2 6.Kf6 Kf3 7.Kf5 Kg2 8.Kg6 Kh3 9.Kh5 Kxh2 10.Kxh6 3:43 15/19 0.17 106504583 1.Kb5 Kb3 2.Kc6 Kc3 3.Kd7 Kd4 4.Ke6 Ke3 5.Kf6 g4 6.Kf5 g3 7.hxg3 Kf2 8.g4 Kxg2 9.Kf4 Kh3 10.Kf3 ******************************************************************************************** TheKing 3.23 with 32 MB transposition tables, ponder=off, P4 1800/512 Time Depth Score Positions Moves 0:00 12/16 0.10 247681 1.Kb5 Kb3 2.g4 Kc3 3.Kc5 Kd3 4.Kd5 Ke3 5.Ke5 Kf2 6.Kf6 Kf3 7.Kf5 Kg2 8.Kg6 Kxh2 9.Kxh6 0:00 13/17 0.04 345831 1.Kb5 Kb3 2.g4 Kc3 3.Kc5 Kd3 4.Kd5 Ke3 5.Ke5 Kf2 6.Kf6 Kf3 7.Kf5 Kg2 8.Kg6 Kh3 9.Kh5 0:01 14/18 0.10 468122 1.Kb5 Kb3 2.g4 Kc3 3.Kc5 Kd3 4.Kd5 Ke3 5.Ke5 Kf2 6.Kf6 Kf3 7.Kf5 Kg2 8.Kg6 Kh3 9.Kh5 Kxh2 10.Kxh6 0:01 15/19 0.10 601592 1.Kb5 Kb3 2.g4 Kc3 3.Kc5 Kd3 4.Kd5 Ke3 5.Ke5 Kf2 6.Kf6 Kf3 7.Kf5 Kg2 8.Kg6 Kh3 9.Kh5 Kxh2 10.Kxh6 0:02 16/20 0.19 1078106 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 Kh3 10.Kf3 Kh4 0:05 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 3:10 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 ********************************************************************************************
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