Author: Odd Gunnar Malin
Date: 02:07:31 09/08/01
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On September 07, 2001 at 23:10:53, Peter McKenzie wrote: >On September 07, 2001 at 22:08:27, Odd Gunnar Malin wrote: > >> >>I don't have his position but I have another 'quadrat position' like the Fine 70 >>with a not so obvious first move, well it is Kb1 but that must be a coincidence >>:) >> >>[D]2k5/2p2p2/2p1p3/2P1PpP1/1p1P1p2/1P3P2/1K3P2/8 w - - 0 1 >>White wins. 1.Kb1! > >Are you sure? >I ran it through LambChop, and the prefered move was switching between Kb1 and >Kc2 with a score of around 0.4 for each move. Then at depth 25 I got a fail >high on Kc2, returning a score of 1.6. > >As I write, the same score has popped up for Kc2 at depth 26 too... > The position is from Averbach's book on pawn endgames. In my german version is in on p.378. I have tried to follow other path than that Averbach's solution but they all end in draw. Here is his solution. The quadrat: White: e2=1, d2=2, e1=3, d1=4 Black: b7=1, a7=2, b8=3, a8=4 You can shifting this quadrat two sqaures so. f.ex white also has a quadrat on c2=1, b2=2, c1=3, b1=4. Die kürzesten Wege bestehen hier aus jeweils acht Feldern: c4-d3-e2-f1-g2-h3-h4-h5 bzw. a5-a6-b7-c8-d7(d8)-e7(e8)-f8-g7. Die Paare c4-d3 und h4-h5 können nicht als Basisfelder genommen werden, weil sie kein Verbindungsfeld besitzen. Zur Wahl stehen die Felderpaare d3-e2 (a6-b7 bei Schwarz) oder e2-f1 (b7-c8 bei Schwarz). In beiden Fällen erhälten wir das Quadratsystem mit übereinstimmenden Hauptzonen. 1.Kb1! (jetzt muss Schwarz das Feld 1 oder 3 betreten) 1...Kb8 2.Kc1 Ka8 3.Kd1 Kb8 4.Ke1 Kb7 5.Ke2, und Weiss gewinnt. Running through www.freetranslation.com: The shortest ways consist here of respectively eight fields: c4-d3-e2-f1-g2-h3-h4-h5 and/or a5-a6-b7-c8-d7(d8)-e7(e8)-f8-g7. The couples c4-d3 and h4-h5 cannot be taken as a basis field because they possess no connection field. To the choice, the field couples d3-e2 (a6-b7 stand in black) or e2-f1 (b7-c8 in black). In both felling receiving we the square system with übereinstimmenden head zone. 1.Kb1! (Now must black the field 1 or 3 enter) 1...Kb8 2.Kc1 KA8 3.Kd1 KB8 4.Ke1 KB7 5.Ke2, and white win. I'm sure V.Deepeven or A.Silver could explain this theorie, I myself must have some reread of it before I lay out on such a trip. Odd Gunnar
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