Author: Odd Gunnar Malin
Date: 06:09:59 11/22/01
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On November 22, 2001 at 08:52:41, Odd Gunnar Malin wrote: >On November 21, 2001 at 23:55:39, Michel Langeveld wrote: > >>On November 21, 2001 at 19:11:53, Odd Gunnar Malin wrote: >> >>>On November 21, 2001 at 18:23:08, Michel Langeveld wrote: >>> >>>>I build nullmove in my chessprogram and received a problem. >>>> >>>>The example which is on Bruce side seems not to work in certain positions. >>>>Especially positions where it's possible to give mate: >>>> >>>>[D] rnbq1bnr/pp2k3/2p1p1B1/3pP1p1/7p/4PQ2/PPPN1PPP/R3K1NR b KQ >>>> >>>>After Qc7 white doesn't see Qf7 anymore. >>>> >>> >>>Are you using nullmove at the first ply? >>> >>>Odd Gunnar >> >>No at the rootnode I don't do nullmove. >>Is this ok? > >Yes, I was only trying to figur out what could happend. > >After Qc7. > >You try Qf7 >Black is in check so no nullmove here, OK? >Kd8 only move >Qe8# > >Maybe a bug in the mate test then. > >Odd Gunnar After (Qc7) Qf7 Kd8 If you switch side here Black should gain more positional advantage after he switch of queens so this should not be a cutoff. Could it only be that you have to force piece exchange in the eval when up on material. Odd Gunnar
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