Author: Eran
Date: 08:34:44 02/07/02
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On February 07, 2002 at 05:52:26, Torstein Hall 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. >> >>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 Well, I am sure futility pruning has both advantage and disadvantage. Please see below. Advantage: It searches faster and finds best moves earlier. Disadvantage: It may overlook some best moves. Therefore, this is a fine balance between time-control games and long time analysis. The decision of whether to select futility pruning or not is up to you. It is not perfect. Eran
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