Author: J. Wesley Cleveland
Date: 10:12:40 06/04/02
Go up one level in this thread
On June 03, 2002 at 22:50:10, John Merlino wrote: >On June 03, 2002 at 22:39:35, John Merlino wrote: > >>On June 03, 2002 at 19:06:31, Dieter Buerssner wrote: >> >>>On June 02, 2002 at 22:32:25, Dana Turnmire wrote: >>> >>>>-- -- -- -- -- -- -- -- >>>>-- -- -- -- -- -- -- -- >>>>-- -- -- -- -- -- BK -- >>>>-- -- BP -- BP -- -- -- >>>>-- -- WP -- WP -- WK -- >>>>-- -- -- WN -- -- -- -- >>>>-- -- -- -- -- -- -- -- >>>>BB -- -- -- -- -- -- -- >>>> >>>>Here is the test position found in "The Mammouth Book of Chess." >>>> >>>>1Nxc5? >>>> >>>>This obvious, materialistic move throws away the win. White's c-pawn cannot be >>>>advanced to the queening square without the help of the king, but this allows >>>>Black to counter by attacking the e-pawn. White should not take the c-pawn, but >>>>instead make progress on the kingside by manoeuvring his knight. >>> >>>Can you please show a (sample) winning line. My program went also for Nxc5 for 4 >>>hours (on rather slow hardware). I tried to understand the pos myself. All I >>>came up with - I cannot find improvement for white after this move, and I think, >>>it is draw. However, I have no better idea, that secures the win. >>> >>>Regards, >>>Dieter >> >>We just happened to have that book laying around, and since I hadn't done ENOUGH >>typing today, I figured I'd quote the entire passage from "The Mammoth Book of >>Chess", pg. 386, under the section entitled "Computer Chess". >> >>------------ >>From Pachman-Hromadka, Prague Ch, 1944 >> >> Nxc5? This obvious, materialistic move throws away the win! "White's c-pawn >>cannot be advanced to the queening square without the help of the king, but this >>allows Black to counter by attacking the e-pawn" - Pachman >> Supposing it were instead Black to move, the following variation is >>enlightening: >>1...Bd4 2.Ne1 Bf2 3.Nf3 Kf6 (or 3...Bd4 4.Nh4+ Kf6 5.Nf5) 4.Kh5 Bg3 5.Nh4! Bf2 >>6.Nf5 Bg1 7.Nh6 Bd4 8.Ng4+ Ke6 9.Ng6 > >The last move here should be 9.Kg6, of course.... Sorry about that.... > >> >[D]8/8/4k1K1/2p1p3/2PbP1N1/8/8/8 w - - >> >> White will now play Nf6-h7-g5+, etc., and win easily. However, if there were >>no black pawn on c5, then Black would have sufficient counterplay to hold the >>draw, since his king could use the c5-square to attack White's pawns. >> Thus, in our start position, White should not take the c-pawn, but instead >>make progress on the kingside by manoeuvring his knight. >>------------ >> >>So, the question is, is that correct? Anybody care to throw some serious CPU >>cycles at it? >> >>jm I let crafty run overnight and got nothing.
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