Author: Simon Finn
Date: 03:28:21 10/18/01
Go up one level in this thread
On October 17, 2001 at 13:27:46, Robert Hyatt wrote: >On October 16, 2001 at 08:13:00, Uri Blass wrote: > >>Can your program see the win? >> >>Note that yace needs a long time to avoid Kd4 that is clearly not the fastest >>way to win even if it wins because after 1.Kd4 Kd8 you get a repetition that >>only humans understand and computers do not know to evaluate it as a repetition. >> >>Note that I analyzed this position some years ago and my conclusion was that >>white can win by 1.b6 cxb6 2.a6 bxa6 3.c6 >> >>Yace does not understand the idea and it seems that yace's main line is leading >>to draw. >> >>yace also cannot see deep in the pawn endgame and I wonder if avoiding qsearch >>can help it. >> >>Tiger can get bigger depth but it does not help it to see 1.b6 in a short >>time(maybe 1.Kd3 also wins but it seems to me a strange way to win when 1.b6 is >>the simple way0 >> >>New position >>[D]4k3/pppppppp/8/PPPPPPPP/4K3/8/8/8 w - - 0 1 [snip] >>Uri > > >To avoid a lot of calculating, I would probably try g6 first, and use >the "sneaker" idea to create a passed pawn over there. Once the black king >moves in that direction, b6 to do a "sneaker" on the other side is a simple >win. That doesn't work well because the White king is badly placed on e4. 1. g6 fxg6 2. h6 gxf5+ 3. Kxf5 gxh6 denies White the king-side passed pawn. That's why Tiger's 1. Kd3 is a good idea - White can follow up with b6 and g6 (or vice-versa) without worrying about checks. This produces (at worst) passed pawns on the c and f files which can promote without assistance from the king. > >(note "sneaker" is the name I often saw applied to the idea of playing >b6. if black plays axb6 then white plays c6. If bxc6 then a6 wins. If >bxa5 then cxb7 wins.) > >Note that I don't see an instant win with your suggestion of b6, axb6 c6, as >I play dxc6 and you don't have a passer yet. After recapturing, White intends to follow up with f6, producing passed c and (at worst)e pawns. With the help of his king, one of these queens before Black can promote. > >At shallow searches, Crafty seems to go for e6, which will dislodge the d >pawn and make the queen-side sneaker work if the king can be decoyed >away. Unfortunately, it can't because there's no way to break into the k-side once the f-pawns have been exchanged. > >I haven't spent a lot of time looking at this, of course, so your analysis >could be right for other reasons. But I don't see how b6 wins instantly as >it would if the king was over one more square and the d pawn (for black) was >missing. Simon
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