Author: Uri Blass
Date: 08:38:15 09/15/00
Go up one level in this thread
On September 15, 2000 at 11:09:00, 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 do think the solution is correct. Look at this: > > 1.Lb1 h4 2.Ka4 Ka8 3.Ka3 Kb7 4.Ka2 Ka8 5.Ka1 Kb7 6.La2 Ka8 7.Kb1 Kb7 8.Kc1 Ka8 >9.Kd1 Kb7 10.Ke1 Ka8 11.Lb1 Kb7 12.Kf1 Ka8 13.Kg1 Kb7 14.Kh2 Sg4+ 15.Kh3 Sf2+ >16.Kxh4 Sxh1 > >In "Die Schwalbe 8/2000" a reader ment that after 255. Ka6 the best move for >black is 255...Kd8 and now: 17...Kd8 18.b7 Sd7 19.Lxf3 d3 [19...h1D 20.Lxh1 d3 >21.cxd3 f3 22.Lxf3 Ke7 23.b8D Sxb8+ 24.Lxb8 c2 25.Lxc2 Ke6 26.b6 Kf6 27.b7 Ke6 >28.d4 h2 29.Lxh2 f4 30.b8D Kf7 31.Lxf4 Kg7 32.Lh5 Kf6 33= move 271. De5#] >20.cxd3 h1D 21.Lxh1 f3 22.Lxf3 f4 23.b8D+ Sxb8+ 24.Lxb8 h2 25.Lxf4 h1D 26.Lxh1 >Ke7 27.b6 Ke6 28.b7 c2 29.Lxc2 Ke7 30.b8D Ke6 31.De5+ Kd7 32.Lc6+ Kxc6 33= move >271.De6# > >This suggests the problem is a mate not in 270 but in 271. >Who is right? Come on problem friends!! I am not sure. It may be mate in more than 271 because black can play Kc8 instead of Ka8 in the last iteration(in order to play f2,f1Q abd white has to play b7+ in order to stop it or to get to a complicated queen endgame by letting f2 and playing b7+ Kf7 b8Q after it). Kc8 is possible in many positions(for example the following): [D]8/Bk6/1P6/1P2np2/1P1p1p2/KPp2p1p/2P4p/1B5B b - - 0 1 Uri
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