Author: Bas Hamstra
Date: 16:12:38 11/09/03
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On November 09, 2003 at 03:53:24, Daniel Shawul wrote: > > >>I do not remember if Ernst's paper said that you make the move first and then >>decide if it is futile. >> >>If it did, then it's definitely killing all the interest of futility pruning at >>depth 1! >> >>The idea is to prune before you make the move. So you stay at depth==1, look at >>the move, and say "hey, this move looks completely futile, let's ignore it!". >> >> >> >> Christophe > >A futile move is futile before you make or after you make it. > before > mat_bal + move_gain + margin < alpha => futile move > after > mat_bal + margin < alpha => futile move >Anyway my question is since you go directly to quiescent search >(where stand pat cutoff of all futile moves occur) after making the move, >we only saved ourselves "making of the futile moves".I can comprehend the >extended futlity pruning but not this.For me as long as standing pat cut off >is there , futility pruning at frontier is unnecessary,and if it is,it only >saves the time to make and unmake futile moves.Where does the 60% tree shrinkage >comes from?Please try to see where my proble is. > >Daniel I must say I think excactly like you. That's why I don't do it, it's nonsense. You know what it does? It saves nodes. Cheap worhtless nodes that don't bring you anything but trouble. Best regards, Bas.
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