Author: pavel
Date: 09:24:40 04/13/05
[D] 3n4/rBp1p3/2P5/2PK4/k2N4/pp2R3/bppB2Rp/q1n1r1b1 w - - 0 1 Mate in 29 M. Kwiatkowski 2nd Honourable Mention, The Problemist 1992 1.Rg4 Even if it threatens two short mates, with Nxb3+ and Ne6+, it is still a nice key. 1...h1Q+ 2.Nf3+ Kb5 Now the Knight and Rook each have chores, but they can only do them if they work as a fine-tuned team - one of them holding the Qh1 at bay, while the other one does its job. 3.Rb4+ Ka5 4.Rbe4+! Now the Knight is free. 4...Kb5 5.Nd4+ Ka4 6.Ne2+ Kb5 7.Nc3+ Ka5 8.Nxa2+ Why this Bishop had to go will become clear later. 8...Kb5 Now it is the Rook's turn, but the Knight must first unpin it. 9.Nc3+ Ka5 10.Ne2+ Kb5 11.Nd4+ Ka4 12.Nf3+! Kb5 13.Rb4+ Ka5 14.Rbxb3+ The reason for removing this pawn will be revealed later too, but at least we understand why the Ba2 had to go - it would have pinned the Rb3. 14...Ka4 15.Rb4+ Ka5 16.Rbe4+! and the Knight is unpinned once more. 16...Kb5 17.Nd4+ Ka4 18.Ne2+ Kb5 19.Nc3+ Ka5 20.Na2+! It is a very nice feature of this problem that the Knight goes back to the empty square a2 where it once captured a Bishop. Now, it has to shield a3 from the Qa1. 20...Kb5 21.Ba6+ Finally, the mating attack. 21...Rxa6 If 21...Kxa6, then 22.Rxa3+ (that is why Pb3 had to go and Qxa3 had to be prevented) 22...Kb5 23.Nc3 mate. 22.Nc3+ Ka5 23.Ne2+ Kb5 24.Nd4+ Ka4 25.Nf3+! One last unpin of the Rook, and it's mate: 25...Kb5 26.Rb4+ Ka5 27.Rb6+ Ka4 28.Rxa6+ Kb5 29.Ra5 mate. http://www.xs4all.nl/~timkr/chess2/diarytxt.htm --------------------------------------------------------- So far with Shredder Classic 1.2 New game 3n4/rBp1p3/2P5/2PK4/k2N4/pp2R3/bppB2Rp/q1n1r1b1 w - - 0 1 Analysis by Shredder Classic 1.2: 1.Bxe1 -+ (-31.21) Depth: 1/8 00:00:00 1.Bxe1 -+ (-31.21) Depth: 1/8 00:00:00 1.Rg4 = (0.14) Depth: 1/8 00:00:00 1.Rg4 = (0.14) Depth: 1/8 00:00:00 1.Rg4 h1Q+ = (0.14) Depth: 2/8 00:00:00 1.Rg4 h1Q+ = (-0.11) Depth: 3/8 00:00:00 1.Rg4 h1Q+ ³ (-0.61) Depth: 3/8 00:00:00 1.Rg4 h1Q+ 2.Nf3+ Kb5 -+ (-37.04) Depth: 3/11 00:00:00 1.Bxe1 -+ (-37.03) Depth: 3/11 00:00:00 1.Bxe1 -+ (-36.68) Depth: 3/11 00:00:00 1.Bxe1 h1Q 2.Nxc2 -+ (-36.16) Depth: 3/13 00:00:00 1.Rxe1 -+ (-36.15) Depth: 3/13 00:00:00 1.Rxe1 -+ (-35.80) Depth: 3/13 00:00:00 1.Rxe1 e6+ 2.Rxe6 b1Q -+ (-31.69) Depth: 3/13 00:00:00 1.Rxe1 e6+ -+ (-32.00) Depth: 4/16 00:00:00 1.Rxe1 b1Q 2.Rgxg1 -+ (-32.00) Depth: 4/16 00:00:00 1.Rxe1 b1Q -+ (-32.45) Depth: 5/16 00:00:00 1.Rxe1 h1Q 2.Rexg1 Qh5+ 3.Rg5 Qf7+ 4.Ke4 -+ (-32.79) Depth: 5/16 00:00:00 1.Rxe1 h1Q 2.Rexg1 Qh5+ 3.Rg5 Qf7+ 4.Ke4 b1Q -+ (-32.79) Depth: 6/23 00:00:00 39kN 1.Rg4 -+ (-32.78) Depth: 6/25 00:00:00 92kN 1.Rg4 -+ (-32.43) Depth: 6/29 00:00:01 102kN 1.Rg4 h1Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rg4+ Kb5 5.Rb4+ Ka5 6.Rg4+ Kb5 = (0.04) Depth: 6/29 00:00:01 117kN 1.Rg4 h1Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rbe4+ Kb5 5.Nd4+ Ka4 = (0.06) Depth: 7/29 00:00:01 128kN 1.Rg4 h1Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rbe4+ Kb5 5.Nd4+ Ka4 = (0.06) Depth: 8/29 00:00:01 160kN 1.Rg4 h1Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rbe4+ Kb5 5.Nd4+ Ka4 = (0.06) Depth: 9/29 00:00:02 307kN 1.Rg4 h1Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rbe4+ Kb5 5.Nd4+ Ka4 = (0.06) Depth: 10/29 00:00:04 653kN 1.Rg4 h1Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rbe4+ Kb5 5.Nd4+ Ka4 = (0.08) Depth: 11/29 00:00:05 1744kN 1.Rg4 h1Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rbe4+ Kb5 5.Nd4+ Ka4 = (0.10) Depth: 12/29 00:00:08 4533kN 1.Rg4 h1Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rbe4+ Kb5 5.Nd4+ Ka4 = (0.10) Depth: 13/29 00:00:18 10715kN 1.Rg4 h1Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rbe4+ Kb5 5.Nd4+ Ka4 = (0.12) Depth: 14/29 00:00:37 23338kN 1.Rg4 h1Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rbe4+ Kb5 5.Nd4+ Ka4 = (0.14) Depth: 15/29 00:01:23 51452kN 1.Rg4 h1Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rbe4+ Kb5 5.Nd4+ Ka4 = (0.14) Depth: 16/31 00:03:20 112629kN 1.Rg4 h1Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rbe4+ Kb5 5.Nd4+ Ka4 = (0.15) Depth: 17/32 00:07:17 241546kN 1.Rg4 h1Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rbe4+ Kb5 5.Nd4+ Ka4 = (0.15) Depth: 18/35 00:15:11 507078kN 1.Rg4 h1Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rbe4+ Kb5 5.Nd4+ Ka4 = (0.15) Depth: 19/38 00:33:03 1090950kN 1.Rg4 h1Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rbe4+ Kb5 5.Nd4+ Ka4 = (0.15) Depth: 20/41 01:13:32 2366093kN (, MyTown 13.04.2005)
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