Author: Bernhard Bauer
Date: 05:43:27 09/15/00
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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
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