Author: Tom Brake
Date: 14:17:37 04/13/05
Go up one level in this thread
On April 13, 2005 at 14:25:51, John Merlino wrote: >On April 13, 2005 at 12:24:40, pavel wrote: > >>[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) > >The King cannot find this mate from the initial position because it has a search >depth of (I think) 47 plies. > >So, just move the position forward to after 6.Ne2+, and The King says "Mate in >23" in less than a second: > >[D]3n4/rBp1p3/2P5/2PK4/k3R3/pp2R3/bppBN3/q1n1r1bq b - - 0 6 > >Time Depth Score Positions Moves >0:00 1/3 0.00 903 6...Kb5 7.Nd4+ >0:00 1/4 0.00 5096 6...Kb5 7.Nd4+ >0:00 1/5 0.00 16935 6...Kb5 7.Nd4+ >0:00 1/6 0.00 50798 6...Kb5 7.Nd4+ >0:00 1/7 Mate23 163463 6...Kb5 7.Nc3+ Ka5 8.Nxa2+ Kb5 > 9.Nc3+ Ka5 10.Ne2+ Kb5 11.Nd4+ > Ka4 12.Nf3+ Kb5 13.Rb4+ Ka5 14.Rbxb3+ > Ka4 15.Rb4+ Ka5 16.Rbe4+ Kb5 17.Nd4+ > Ka4 18.Ne2+ Kb5 19.Nc3+ Ka5 20.Na2+ > Kb5 21.Ba6+ Rxa6 >0:01 1/8 Mate23 479548 6...Kb5 7.Nc3+ Ka5 8.Nxa2+ Kb5 > 9.Nc3+ Ka5 10.Ne2+ Kb5 11.Nd4+ > Ka4 12.Nf3+ Kb5 13.Rb4+ Ka5 14.Rbxb3+ > Ka4 15.Rb4+ Ka5 16.Rbe4+ Kb5 17.Nd4+ > Ka4 18.Ne2+ Kb5 19.Nc3+ Ka5 20.Na2+ > Kb5 21.Ba6+ Rxa6 >0:03 1/9 Mate23 1274599 6...Kb5 7.Nc3+ Ka5 8.Nxa2+ Kb5 > 9.Nc3+ Ka5 10.Ne2+ Kb5 11.Nd4+ > Ka4 12.Nf3+ Kb5 13.Rb4+ Ka5 14.Rbxb3+ > Ka4 15.Rb4+ Ka5 16.Rbe4+ Kb5 17.Nd4+ > Ka4 18.Ne2+ Kb5 19.Nc3+ Ka5 20.Na2+ > Kb5 21.Ba6+ Rxa6 >0:10 1/10 Mate23 3425030 6...Kb5 7.Nc3+ Ka5 8.Nxa2+ Kb5 > 9.Nc3+ Ka5 10.Ne2+ Kb5 11.Nd4+ > Ka4 12.Nf3+ Kb5 13.Rb4+ Ka5 14.Rbxb3+ > Ka4 15.Rb4+ Ka5 16.Rbe4+ Kb5 17.Nd4+ > Ka4 18.Ne2+ Kb5 19.Nc3+ Ka5 20.Na2+ > Kb5 21.Ba6+ Rxa6 > >Also notice that The King will not report a PV longer than 31 plies, which is >why the full mate sequence is not shown. > >jm This is very odd then, as I get this from CM9K on an Athlon 64: Time Depth Score Positions Moves 0:00 1/4 0.16 612 1.Nf3 Nf6 2.d3 d6 0:00 1/5 0.31 4009 1.e4 Nc6 2.Nf3 e5 3.d4 exd4 4.Nxd4 0:00 1/5 0.32 4754 1.Nf3 Nf6 2.d3 d5 3.Be3 0:00 1/5 0.33 5899 1.Nc3 d5 2.e4 dxe4 3.d4 0:00 1/6 0.17 9825 1.Nc3 Nc6 2.d4 d5 3.e4 dxe4 0:00 1/6 0.22 20156 1.e4 d5 2.Nc3 Nf6 3.exd5 e5 0:00 1/7 0.35 42256 1.e4 d5 2.Nc3 Nf6 3.Nxd5 Nxd5 4.exd5 Qxd5 5.Ne2 0:00 1/8 0.33 141663 1.e4 d5 2.exd5 Nf6 3.Bb5+ Bd7 4.Nc3 Bxb5 5.Nxb5 Nbd7 0:02 1/9 0.47 397886 1.e4 d5 2.exd5 Nf6 3.d4 e6 4.dxe6 Bxe6 5.Nc3 ---- ---- ---- ---- ---- 0:00 1/3 -23.58 3320 1.Rc3 Re5+ 2.Kxe5 Bxd4+ 3.Kxd4 h1=Q 4.Rc4+ Kb5 0:00 1/4 -24.40 29618 1.Rc3 e6+ 2.Nxe6 Re5+ 3.Kxe5 Nd3+ 4.Kd5 h1=Q 0:00 1/4 0.00 44003 1.Rg4 h1=Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rc4+ Kb5 5.Rb4+ 0:00 1/5 0.00 74005 1.Rg4 h1=Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rc4+ Kb5 5.Rb4+ 0:00 1/6 0.00 133023 1.Rg4 h1=Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rc4+ Kb5 5.Rb4+ 0:01 1/7 0.00 319562 1.Rg4 h1=Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rc4+ Kb5 5.Rb4+ 0:03 1/8 0.00 739682 1.Rg4 h1=Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rc4+ Kb5 5.Rb4+ 0:08 1/9 Mate29 2068494 1.Rg4 h1=Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rbe4+ Kb5 5.Nd4+ Ka4 6.Ne2+ Kb5 7.Nc3+ Ka5 8.Nxa2+ Kb5 9.Nc3+ Ka5 10.Ne2+ Kb5 11.Nd4+ Ka4 12.Nf3+ Kb5 13.Rb4+ Ka5 14.Rbxb3+ Ka4 15.Rb4+ Ka5 16.Rbe4+ Kb5 17.Nd4+ Ka4 18.Ne2+ Kb5 19.Nc3+ Ka5 20.Na2+ Kb5 21.Ba6+ Rxa6 22.Nc3+ Ka5 23.Ne2+ Kb5 24.Nd4+ Ka4 25.Nf3+ Kb5 26.Rb4+ Ka5 27.Rb6+ Ka4 28.Rxa6+ Kb5 29.Ra5# 0:12 2/10 Mate29 3367414 1.Rg4 h1=Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rbe4+ Kb5 5.Nd4+ Ka4 6.Ne2+ Kb5 7.Nc3+ Ka5 8.Nxa2+ Kb5 9.Nc3+ Ka5 10.Ne2+ Kb5 11.Nd4+ Ka4 12.Nf3+ Kb5 13.Rb4+ Ka5 14.Rbxb3+ Ka4 15.Rb4+ Ka5 16.Rbe4+ Kb5 17.Nd4+ Ka4 18.Ne2+ Kb5 19.Nc3+ Ka5 20.Na2+ Kb5 21.Ba6+ Rxa6 22.Nc3+ Ka5 23.Ne2+ Kb5 24.Nd4+ Ka4 25.Nf3+ Kb5 26.Rb4+ Ka5 27.Rb6+ Ka4 28.Rxa6+ Kb5 29.Ra5# 0:34 2/11 Mate29 9736612 1.Rg4 h1=Q+ 2.Nf3+ Kb5 3.Rb4+ Ka5 4.Rbe4+ Kb5 5.Nd4+ Ka4 6.Ne2+ Kb5 7.Nc3+ Ka5 8.Nxa2+ Kb5 9.Nc3+ Ka5 10.Ne2+ Kb5 11.Nd4+ Ka4 12.Nf3+ Kb5 13.Rb4+ Ka5 14.Rbxb3+ Ka4 15.Rb4+ Ka5 16.Rbe4+ Kb5 17.Nd4+ Ka4 18.Ne2+ Kb5 19.Nc3+ Ka5 20.Na2+ Kb5 21.Ba6+ Rxa6 22.Nc3+ Ka5 23.Ne2+ Kb5 24.Nd4+ Ka4 25.Nf3+ Kb5 26.Rb4+ Ka5 27.Rb6+ Ka4 28.Rxa6+ Kb5 29.Ra5#
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