Author: Michel Langeveld
Date: 08:32:08 10/16/03
Go up one level in this thread
On October 16, 2003 at 09:03:42, Ernst Walet wrote: >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. Yes it's hard work ... long evenings ... and less sleep... :-) But I have a version of Nullmover that plays stronger as last time in Leiden. About 100 elo. Not a big deal but enough to have some fun again.
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