Author: Uri Blass
Date: 07:47:47 09/15/00
Go up one level in this thread
On September 15, 2000 at 10:43:06, Robert Hyatt wrote: >On September 15, 2000 at 10:34:53, Uri Blass wrote: > >>On September 15, 2000 at 10:20:57, Helmut Conrady wrote: >> >>>On September 15, 2000 at 09:01:22, Andreas Stabel wrote: >>> >>>>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 don't think this solution is correct. Black has to move some pawns during >>>>the first white king tour or the white king will escape to g3 or h3 and >>>>start munching black pawns and win that way. To stop this black has to do >>>>the following pawn moves h4-h3-h2 and f5-f4. This will cause the mate to >>>>be a lot less than 270, but still awesome. >>> >>>I think the 270 moves must be correct, because this problem was discussed in the >>>problem magazine "Die Schwalbe" 8/2000. The discussion was: 270 or 271 moves to >>>mate. :) >>> >>> >>>Helmut >> >>This is not convincing because you need to prove that there is no shorter mate. >>The problem seem to be not a good problem also because the solution is not >>unique and white can win by 1.Ka4 instead of 1.Bb1 >> >>Uri > > >I think the point is that if not Bb1, then c3 gives white a headache. With the >bithop at b1, c3 simply drops the pawn. You are right. It should be d3. After Ka4 d3 I see that white cannot prevent a new black queen. Uri
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