Author: Uri Blass
Date: 05:30:07 02/07/02
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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
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