Author: Uri Blass
Date: 11:56:13 08/15/02
Go up one level in this thread
On August 15, 2002 at 13:03:07, Miguel A. Ballicora wrote: >On August 15, 2002 at 08:31:36, Uri Blass wrote: > >>On August 14, 2002 at 06:37:04, T. Opas wrote: >> >>>On August 13, 2002 at 23:42:32, Uri Blass wrote: >>> >>>>On August 13, 2002 at 19:04:59, Mike S. wrote: >>>> >>>>>On August 13, 2002 at 17:05:24, Chris wrote: >>>>> >>>>>>4rrk1/1bpR1p2/1pq1pQp1/p3P2p/P1PR3P/5N2/2P2PP1/6K1 w - a6 0 31 >>>>>>Does any program find Shorts 31. Kh2? >>>>>> >>>>>>31.Kh2! Rc8 32.Kg3 Rce8 33.Kf4 Bc8 34.Kg5 with the idea Kh6 and mate.. >>>>>> >>>>>>The idea of mating with the king in the middle game is very unusual, but maybe >>>>>>the programs can find it anyway by using brute force? >>>> >>>>I tried deep fritz for some hours(selectivity=0,p850,64 mbytes) with no success >>>>so maybe black has a defence after Kh2. >>>> >>>Theres no defence: >>> >>>31.Kh2! Bc8 (best blacks move) 32.Ng5! Qxd7 (32....Bxd7 33.g4! hxg4 34.h5! +-) >>>33.Rxd7 Bxd7 34.g4! +- >>> >>>Las >> >>You are right. >> >>The question is how much time programs need to see >>a winning score from the root position(the only open question >>is if Kh2 is the only way to win) . >> >>Finding 32.Ng5 is also a good test position >>and here not using null move pruning does not help. > >On the contrary, I think that null move pruning hurts here. > >Miguel Not about finding 32.Ng5 I tested Fritz with and without null move pruning and Fritz can find Ng5 faster with null move pruning. null move pruning hurts in finding Kg3->h6 after Kh2 Rc8 lines but after Kh2 Bc8 there is no need for Kg3->h6 and Ng5 has threats. Uri
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.