Author: Andreas Stabel
Date: 08:35:55 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 > I think you're rigth - I analyzed this position with crafty and it is a clear win for black. If white does not enter this variation it will be a draw if white does not go for the full solution. Thanks for your help. Andreas >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!! > >My connection to computer chess is to compare this with the deepest EGDB mate >which is one in 262 in RN-NN (DTM). > >Thanks for your help > >Helmut
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