Author: Enrique Irazoqui
Date: 02:26:35 06/28/00
Go up one level in this thread
On June 27, 2000 at 21:38:36, Robert Hyatt wrote: >On June 27, 2000 at 19:39:42, Robin Smith wrote: > >>On June 27, 2000 at 17:41:33, Robert Hyatt wrote: >> >>>On June 27, 2000 at 14:44:10, Robin Smith wrote: >>> >>>>On June 27, 2000 at 08:43:49, Enrique Irazoqui wrote: >>>> >>>>>Thorsten posted an interesting position in >>>>>http://www.oxford-softworks.com/cgi-bin/forums/mschess/558.html: >>>>> >>>>>[D]2R5/4k1pp/p3p3/4P1p1/p3N3/q1P4P/2P1P1P1/1K6 w - -; bm e4d6; >>>>> >>>>>Thorsten's comments: >>>>> >>>>>"Here how CSTal2.03 plays on my k6-3/400: >>>>> >>>>>1. d9 8" >>>>>2. d12 105" >>>>>3. d14 475" >1.17 >>>>>4. d14 615" +4.24 e4d6 g7g6 e2e3 h7h6 e3e4 g5g4 h3g4 h6h5 g4h5 g6h5 g2g3 >>>>> >>>>>1.After 8 seconds for the first time the key-move , than changed into another. >>>>> >>>>>2.After 105 seconds it has the Nd6 again in depth 12. >>>>> >>>>>3.After 475 seconds it gets a fail high to >1.17. >>>>> >>>>>4.After 615 it knows HOW high and says +4.24 with the main-line shown above." >>>>> >>>>>Aside from CST 2.03, only Genius 6.5 (and older versions, I guess) finds the >>>>>right line in less than 5 minutes and fails high. Shredder 4 and SOS pick Nd6, >>>>>but with a wrong line and a 0.00 evaluation. Tiger, Fritz, Junior, Hiarcs, >>>>>Nimzo, Rebel, AnMon, Crafty, CM6K, don't see that the black queen is trapped and >>>>>white can zugzwang black. >>>>> >>>>>Enrique >>>> >>>>Very interesting position!! The pieces on both sides are in zugswang, so the >>>>pawns decide everything. After 1.Nd6 g6 2.e3 h6 3.e4 I think 3. ... h5 instead >>>>of 3. ... g4? is a better defensive try, but afterwards 4.g3! g4 5.h4! (5.hg? hg >>>>=) g5 6.hg h4 7.g6 hg 8.g7 g2 9.g8=N+! and mate in two. So programs that can't >>>>see underpromotions (Junior5) won't ever solve this one. And the underpromotion >>>>occuring on ply 17 in a position where black threatens mate in one doesn't make >>>>it easy for ANY program. Congratulations to CSTal! >>>> >>>>Robin Smith >>> >>> >>>Do you really think it understood this game? Or do you think it was just >>>"lucky"??? >> >>Failing high with a score > 4 pawns sure sounds like it "understood" to me. >> >>Robin Smith > > >CST has been known to fail high to over +5, and four moves later be at -9, >also... But in this case it shows the right line too, like Genius. That's no luck. Enrique
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