Author: Ernst Walet
Date: 06:03:42 10/16/03
Go up one level in this thread
On October 16, 2003 at 06:45:31, Michel Langeveld wrote: >On October 15, 2003 at 15:09:32, Michel Langeveld wrote: > >>On October 15, 2003 at 13:21:20, Gerd Isenberg wrote: >> >>>On October 15, 2003 at 12:37:43, Michel Langeveld wrote: >>> >>>>[D]8/k7/3p4/p2P1p2/P2P1P2/8/8/K7 w - - >>>> >>>>This position really bothers me ... and bothers nullmover... >>>>nullmover takes a really long time to see that the pawn can be really won. >>>> >>>>At ply 23 we see the keymove Kb1, but it needs 26 ply after 6 minutes we see >>>>that Kb1 wins a true pawn. >>>> >>>>The hashhit percentage is only 3%. >>>>The FH is only 30% >>>> >>>>Do I have to be worried ... or is this still all normal? >>> >>>Hi Michel, >>> >>>no, absolutely not. There is something wrong with your hash-table. >>>Hash-hits in IsiChess are about 70-80%, exact hits ~25%. >>>Depth 30 with >3.00 score after 0.5 seconds on Athlon XP 2.6+. >> >>Thanks for the hashnumbers ... I calculated my hashhits wrong. >>I casted to an int ... and this made it go wrong because the hashhit >>counter is bigger as 32 bit. I cast it now to a double and I hit around 50% >>I will calculate the exact hits also. >> >>>I'll hope you don't fix this severe bug until saturday ;-) >> >>Yes I hope to fix it also :-) > >The problem is complicated ... and all things in Nullmover seem to be correlated >with not finding this move: hash, hashreplace algoritm, evaluation, >moveordering, lazy evaluation. > >In order words the error is not one thing alone but a sum-up of things that >works in the most of the positions but sub-optimal in others. And in this >particulair position it ends up in horror. > >I found out that if I use: >- an always replace algoritm >- take away my lazy evaluation > >I find Kb1 on ply 22 >I get 33 ply almost instantly >I get 40 ply in a minute with a nice score of +2.38 score on Kb1 and Kxf5 in >the PV. > >The problem with always replace is that on WAC I score only 210 out of 300 with >2 seconds a position and else 265 / 300 on 2 seconds...... > >still puzzling You must be happy, two days before Leiden :) See you there.. A passionate observer ;) Ernst.
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