Author: Les Fernandez
Date: 21:06:49 12/30/02
Go up one level in this thread
On December 30, 2002 at 05:21:59, Uri Blass wrote: >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. Hi Uri, I see by following some of these posts that developing any generalized rules for pawn structures is going to be far from simple. I think I might for the moment ignore pawns in my generator until there is more understanding of various pawn formations. Thank you all for giving this link some thought, I have found it very informative. Les > >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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