Author: Ricardo Gibert
Date: 17:04:30 12/08/00
Go up one level in this thread
On December 08, 2000 at 16:15:06, Uri Blass wrote: >On December 08, 2000 at 14:47:37, Dann Corbit wrote: > >>[D]2r3k1/5p2/1p2pp1p/pPq5/Pn6/1B6/1P2QPPP/3R2K1 w - - 0 25 >> >>It seems some programs get the right answer immediately (e.g. Phalanx) and >>others simply never find it. >> >>My question is, "Why?" >> >>I tried programs that don't do NULL move, and that did not seem to help. So >>what is preventing programs from finding the right choice? > >I think that programs that find it immediately do it because of different >evaluation function. > >They do not see a forced win. > > > >I am not sure if Bxe6 is winning. >The main question is if white is winning after > >1.Bxe6 fxe6 2.Qxe6+ Kh8 and I only analyzed it for a short time so I do not >know. > >2...Kg7 is probably losing because of the forced line 3.Rd7+ Kg6 4.g4 Rf8 5.Qe4+ >f5 6.Qe6+ Kg5 7.h3 > >Uri My quick analysis with assistance frm Fritz4 produced: 1.Bxe6 fxe6 2.Qxe6+ Kh8 3.Qxf6+ Kg8 4.Qg6+ Kh8 5.Qxh6+ Kg8 6.Qe6+ Kh8 7.g3 Rf8 8.Qh3+ Kg7 [8...Kg8 9.Qg4+] 9.Qg4+ [9.Rd7+ Rf7] 9...Kh8 10.Rd4 Rxf2 [10...Qc1+ 11.Kg2 Qh6 12.Qe2 Rg8 13.Qc4 Rg5 14.Rh4 Rh5 15.Qd4+ Kg8 (15...Kh7 16.Qd7+ Kg6 17.Qe8+) 16.Rg4+ Kf7 17.Rf4+ Ke7 18.Re4+] 11.Qh4+ Kg7 12.Rg4+ Kf7 13.Rc4 Qe3 14.Rc7+ Ke8 15.Rc8+ Kf7 16.Qh7+ Kf6 17.Rf8+ Ke5 18.Re8+ Kd4 19.Qg7+ Whether the above is actually correct or not does not matter I think. One way or another, White should win with four pawns plus Q & R onboard plus exposed K. The Black Knight is a particularly unfortunate piece to possess on the Q-side in this type of position. Whenever you possess a Knight in these exposed King positions with Knight on the Q-side, Black must overcome 2 obstacles to get his Knight back into play: 1) Time 2) Lack of a central pawn presence to bridge the Knights way back to the K-side. In other words, it's not going to happen, the Knight is irrelevant.
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