Author: Uri Blass
Date: 07:54:19 09/15/00
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On September 15, 2000 at 08:43:27, Bernhard Bauer wrote: >On September 15, 2000 at 08:18:59, Helmut Conrady wrote: > >>Im wondering, what is the deepest chessproblem ever composed. There is a problem >>created by Petrovic in 1969 which might lead to a mate in 270. >> >>[D]8/Bk3p1p/1P3p2/KP2n2p/1P1p4/1Pp2p2/B1P5/7B w - - 0 1 >> >>Unfortunately I haven t got the solution. >> >>Can onyone explain how to win this. >>Does anyone know a deeper problem? >> >>Thanks in advance. >> >>Helmut > >Found an old posting. >----------------------------------------------------------------- >The task record for a legal position is this one: > >Petrovici, "Problem", 1969 >White: Ka5, Ba2, Ba7, Bh1, pb3, pb4, pb5, pb6, pc2 (9) >Black: Kb7, Ne5, pc3, pd4, pf3, pf6, pf7, ph5, ph7 (9) >#270 > >Solution: > >1.Bb1 h4 2.Ka4 Ka8 >(Black's king oscillates to and from b7 except when a black >pawn is moved) >3.Ka3 4.Ka2 5.Ka1 6.Ba2 7.Kb1 8.Kc1 9.Kd1 10.Ke1 11.Bb1 >12.Kf1 (White begins a triangulation in order to lose the move) >13.Kf2 14.Ke1 15.Kd1 15.Kc1 17.Ba2 18.Kb1 19.Ka1 20.Bb1 >21.Ka2 22.Ka3 23.Ka4 Kb7 24.Ka5 f5 >(Black moves a pawn rather than permit White's king to be >moved to a6. White makes nine more triangulations, each time >forcing Black to move a pawn) >47...pf4 70...pf6 93...pf5 116...ph3 139...ph2 162...ph6 >185...ph5 208...ph4 231...ph3, and now >254.Ka5 Kc8 255.Ka6 f2 256.b7+ Kd7 257 b8=Q f1=Q 258.Q:e5 Q:h1 >259.Qg7+ Ke6 260.Qg6+ Ke5 261.Bb8+ Ke4 262.Qc6+ Ke3 263.Q:h1 Kf2 >264.B:f4 Ke2 265.b6 d3 266.c:d3 Kf2 267.Bc2 Ke2 268.Bd1+ Kf2 >269.Qf3+ Kg1 270.Be3 mate. > >Cornel Pacurar >http://www.orbonline.net/~corpac/index.html >---------------------------------------------------------------------- >Kind regards >Bernhard I think that all the white moves should be unique to have a good problem. I suspect that part of the moves are not unique(for example it seems to me that white can change the order of moves 9-11). Uri
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