Author: Torstein Hall
Date: 02:52:26 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. > >What is futility pruning? According to the information from the Fritz7 online >help as follows below. > >Futility pruning: This is an aggressive method of narrowing down the search. It >allows the program to go much deeper, but it also increases the possibility that >it will oversee something. > >Selecting and deselecting Futility pruning feature is available inside the >Fritz7 engine parameters dialog box. > >Eran As futility pruning is pruning lines that looks futile, I would guess it is getting a lower score in tactical test sets. But I belive it will perform better in most normal positions in a chess game. Torstein
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