Author: Gordon Rattray
Date: 04:10:00 10/06/04
Go up one level in this thread
On October 06, 2004 at 06:53:51, martin fierz wrote: >On October 06, 2004 at 06:04:29, Gordon Rattray wrote: > >>On October 06, 2004 at 04:04:40, Uri Blass wrote: >> >>>On October 06, 2004 at 03:38:08, martin fierz wrote: >>> >>>>On October 05, 2004 at 23:42:12, Albert Silver wrote: >>>> >>>>>On October 05, 2004 at 19:59:48, Gordon Rattray wrote: >>>>> >>>>>>I've noticed that Shredder 8 and Deep Fritz 8 don't stick with e5, and switch to >>>>>>Nf5. The last iteration of each search was allowed to complete in case e5 was >>>>>>chosen again. >>>>>> >>>>>>cheers >>>>>> >>>>>>Gordon >>>>>> >>>>>>--------------------- >>>>>> >>>>>>Hardware: Dual Opteron 248, 1 GB for hash >>>>>> >>>>>>Analysis by Shredder 8: >>>>>> >>>>>>1.Bxb4 Rxb4 2.Rf4 >>>>>> -+ (-1.77) Depth: 1/2 00:00:01 >>>>>>1.Bxb4 Rb6 2.Nc2 Qb2 3.Bc3 >>>>>> µ (-1.08) Depth: 1/3 00:00:01 >>>>>>1.Bxb4 Rb6 2.Nc2 Qb2 3.Bc3 >>>>>> +- (2.20) Depth: 2/2 00:00:01 >>>>> >>>>>(...) >>>>> >>>>>>1.Nf5 Ra7 2.Nh6+ Kg7 3.Nf5+ Kf8 4.Rxb3 axb3 5.Bxb4 Rxb4 6.Nxd6 Ra2 7.Qf1 Rb2 >>>>>>8.c5 Qxb1 9.e5 Rxh4 10.Qxb1 Rxb1# >>>>>> -+ (-3.60) Depth: 21/60 00:58:29 3388524kN >>>>> >>>>>One must wonder about a line where the program suggests a move that leads to >>>>>itself getting mated in its main line. Especially when the mate isn't forced. >>>>>:-) >>>>> >>>>> Albert >>>> >>>>..and especially when it evaluates the mate as -3.60 :-) >>>> >>>>cheers >>>> martin >>> >>>It only proves that chess programs has a lot to improve if even the best program >>>evaluates mate as -3.60. >>> >>>Movei never evaluates mate as -3.60 but unfortunately it has other weaknesses. >>> >>>Uri >> >> >>Ok, so we’ve once again highlighted that Shredder 8 can have issues while >>constructing its PV, maybe as a side effect of an optimisation… no news here >>:-) >> >>How about the “minor” detail that neither Shredder or Fritz stick with e5 when >>given an hour or so to analyse… isn’t this more relevant to this thread… > >no, it isn't. as shown above in this thread, white is lost after e5 Qxa3 Rxf7 >Qc1. therefore, it is fine if a program doesn't stick to e5 :-) Ah, so there's agreement all round that this isn't an ideal test position? I thought that this was under discussion?! Gordon > >cheers > martin > > oh >>well… :-) >> >>Gordon
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