Author: Uri Blass
Date: 23:07:31 02/07/02
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On February 07, 2002 at 11:25:17, Eran wrote: >On February 07, 2002 at 08:30:07, Uri Blass wrote: > >>On February 06, 2002 at 19:48:13, Eran wrote: >> >>> >>>The interesting comparative results of the MATS test set (The MAstricht Test >>>Set) are shown below. >>> >>>Fritz7 with futility pruning (selected): >>>Result 18 out of 24 = 75% Average time = 18.05s / 163.09s >>> >>>Fritz7 without futility pruning (deselected): >>>Result 19 out of 24 = 79% Average time = 25.08s / 145.04s >>> >>>Fritz7 with latest update (version 7.0.0.6 - January 22, 2002) >>>MATS test set contains 24 positions in total >>> >>>For more information about MATS test set, please click below >>> >>>http://www.cs.rulimburg.nl/~uiterwyk/icca/mats.htm . >>> >>>Also, the test set in epd format can be downloaded from there. >>> >>>I tried to compare how well Fritz7 played with and without futility pruning. >>>Please see the comments as follows below. >>> >>>Firstly, based on the test Fritz7 without futility pruning seemed to solve more >>>positions than with futility pruning. The only game number 10 in the test set >>>was solved by Fritz7 without futility pruning only. The rest were the same but >>>with futility pruning Fritz7 searched a bit faster. That indicated that without >>>futility pruning Fritz7 seemed to play better in positional games. Obviously, >>>with futility pruning Fritz7 overlooked it because futility pruning was an >>>aggressive, faster and deeper search that might miss some good moves. Secondly, >>>Fritz7 without futility pruning seemed to search slower than with futility >>>pruning but overlooked less. >>> >>>Conclusion: I believe that Fritz7 with futility pruning is better in >>>time-control games in tournament such as rapid chess, sudden death and any >>>tactical-oriented games. On the other hand, if you want to let Fritz7 analyze a >>>position or a game for a long time, futility pruning should be turned off since >>>time is not very important. >> >>I suspect that you did not give Fritz enough time in order to know what happens >>at long time control. >>I think that it may be more interesting to see results of Fritz at 1 hour per >>move with and without futility pruning. >> >>total 48 hours for all the test >>average time of 20 seconds per position means that there was no position when >>Fritz needs more than 10 minutes to solve. >> >>I do not believe that there is no position when Fritz needs more than 10 minutes >>to solve and I guess that if you give Fritz one hour per move you will find more >>information. >> >>I tend to believe that the default option is best for all time control unless I >>see a proof that it is not and the results are not enough to convince me. >> >>Uri > >If the futility pruning cuts one variation that leads to finding the best move >1.b4 in the game # 10 in the MATS test set, then Fritz7 will never search that >variation again because it is cut forever. So I don't believe that if Fritz7 >with futility pruning continues searching, it will ever find the best move 1.b4 >in one or two hours later. I do not think that a very long time calculation for >Fritz with futility pruning makes sense. You are clearly wrong in your assumption For analysis of Fritz7 with futility pruning see http://www.icdchess.com/forums/1/message.shtml?212445 Fritz7 needs more than an hour but it finds b4 Uri
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