Author: Uri Blass
Date: 02:21:59 12/30/02
Go up one level in this thread
On December 30, 2002 at 04:29:28, Hans van der Zijden wrote: >[D]4k3/8/P7/PPPPPPP1/1ppppppp/7p/8/4K3 w - - 0 1 > >Couldn't sleep yesterday, so I tried to reach Uri's pawnposition. I think I >found a pretty short solution. > >1.d3 e6 2.Bd2 Ba3 3.bxa3 a5 4.Bb4 axb4 5.c4 b6 6.Nc3 Ba6 7.Ne4 Bb5 8.Nc5 bxc5 >9.cxb5 c4 10.d4 Na6 11.g3 Nc5 12.Bg2 c6 13.Bd5 cxd5 14.dxc5 d4 15.e4 d6 >16.Nf3 Ra7 17.Ne5 dxe5 18.f4 Qd5 19.exd5 e4 20.Qg4 Re7 21.Qf5 exf5 22.Rg1 Re5 >23.fxe5 f4 24.g4 Ne7 25.a4 Nf5 26.gxf5 f6 27.Rg5 fxg5 28.h4 g4 29.a5 Rf8 >30.a4 Rf6 31.Ra2 Rg6 32.Rh2 Rg5 33.hxg5 g6 34.Rh5 gxh5 35.a6 h4 36.a5 h3 >37.Kf1 h5 38.Ke1 h4 > >Now I could finally sleep:) > >Hans Thanks I wanted only to say that it is not trivial to define a rule for every pawn structure if it can happen. bishops are a factor that should be taken and I can imagine that there are more factoys that I did not think about. The following pawn structure is impossible because the black bishops were not taken by pawns and the number of the other black pieces is only 9 when the white pawns need 10 captures to reach this structure. [D]k7/1p1pp1p1/P7/P7/P7/P7/P7/K7 w - - 0 1 The following pawn structure is also impossible [D]4k3/p2ppppp/p7/p7/8/8/PPPPPPPP/4K3 w - - 0 1 If you move the pawn from a2 to a3 the pawn structure is suddenly possible and I could get the following position in 15 moves [D]r1bqkb1r/p2ppppp/p1n5/p7/8/P7/1PPPPPPP/4KB1R w Kkq - 0 15 You can try it as an exercise before you continue to read the game that is many lines in the end of this post. It is possible to try to get an estimate for the number of possible pawn structures if somebody writes a program that generates a random pseudo legal structure and calculates the number of pseudo legal structure for every number of pawns for both sides. I do not know of a simple way to decide if a pawn structure is possible so writing a program for that task with no mistakes is not an easy task. Uri 1.a2-a3 Ng8-f6 2.Ng1-f3 Nf6-g8 3.Nf3-d4 Ng8-f6 4.Nd4-b3 Nf6-e4 5.Nb3-c5 Ne4-c3 6.Nc5-a6 b7xa6 7.Ra1-a2 Nc3xa2 8.Nb1-c3 Na2xc1 9.Qd1xc1 Nb8-c6 10.Nc3-d5 Nc6-b8 11.Nd5-b6 c7xb6 12.Qc1-a1 Nb8-c6 13.Qa1-a2 Nc6-b8 14.Qa2-d5 Nb8-c6 15.Qd5-a5 b6xa5
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