Author: martin fierz
Date: 03:53:51 10/06/04
Go up one level in this thread
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 :-) cheers martin oh >well… :-) > >Gordon
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