Author: Uri Blass
Date: 00:20:11 03/06/02
Go up one level in this thread
On March 05, 2002 at 21:16:51, Steve wrote: >On March 05, 2002 at 00:10:46, John Merlino wrote: > >>On March 04, 2002 at 22:25:28, Sally Weltrop wrote: >> >>>On March 04, 2002 at 22:23:28, Sally Weltrop wrote: >>> >>>>[D]6k1/6pp/2qb4/8/2pQrNN1/1p3RPP/5P1K/r1B5 w - - 0 36 >>>> >>>>of course 36)Qxa1 and Black resigns next move! >>> >>> >>>this is taken from the 9th rd of Linares 2002 >>> >>>Shirov,A (2715) - Ivanchuk,V (2717) [C88] >>>Linares SuperGM Linares (9), 04.03.2002 >>> >>>1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 0-0 8.a4 Bb7 9.d3 >>>Re8 10.Nbd2 Bf8 11.c3 Na5 12.Ba2 c5 13.d4 d6 14.b4 exd4 15.bxa5 dxc3 16.Nf1 Nxe4 >>>17.axb5 axb5 18.a6 Bc6 19.Rxe4 Bxe4 20.Bxf7+ Kxf7 21.Ng5+ Kg8 22.Nxe4 Qc8 >>>23.Nxc3 Rxa6 24.Rb1 b4 25.Nd5 Ra7 26.Rb3 Ra1 27.h3 Re5 28.Nf4 Qe8 29.Rf3 c4 >>>30.Kh2 b3 31.Qd2 d5 32.Ne3 Bd6 33.g3 Qc6 34.Ng4 d4 35.Qxd4 Re4 36.Qxa1 1-0 >> >>Two blunders in a row! (perhaps a victim of time pressure heading towards time >>control?) >> >>After 34.Ng4, Ivanchuk is clearly in the lead: >> >>Time Depth Score Positions Moves >>0:00 1/3 -1.86 1524 34...Rf5 35.Qc3 Ra2 36.Ne6 >>0:00 1/4 -2.47 6025 34...Rf5 35.Qc3 Ra2 36.Rd3 Rc2 >>0:00 2/5 -2.31 21581 34...Rf5 35.Bb2 Ra2 36.Ne3 Rxf4 >> 37.gxf4 >>0:00 2/6 -1.98 64702 34...Rf5 35.Qc3 Ra7 36.Bb2 Bxf4 >> 37.Rxf4 Rxf4 38.gxf4 >>0:02 3/7 -1.90 217927 34...Rf5 35.Qc3 Ra7 36.Ne6 Rxf3 >> 37.Qxf3 Bb4 38.Nd4 Qd6 >>0:08 3/8 -1.47 707718 34...Rf5 35.Qc3 Ra7 36.Ne6 Rxf3 >> 37.Qxf3 h5 38.Nd4 Qc5 >>0:40 4/9 -1.49 3345172 34...Rf5 35.Qc3 Ra7 36.Ne3 Be5 >> 37.Qb4 Rff7 38.Nexd5 Bxf4 39.Nxf4 >> Qxf3 40.Qb8+ Rf8 41.Qxa7 >>2:45 4/10 -1.51 14440411 34...Rf5 35.Qc3 Ra7 36.Ne6 Rxf3 >> 37.Qxf3 h5 38.Ne5 Bxe5 39.Qf8+ >> Kh7 40.Qf5+ g6 41.Qxe5 >> >>But when the game is over.... >> >>Time Depth Score Positions Moves >>0:00 1/3 3.38 3069 36...Re1 37.Nh5 Qb7 38.Ne3 >>0:00 1/4 3.50 10479 36...Re1 37.Nh5 Qb7 38.Qa5 Qxf3 >> 39.Qxe1 >>0:00 2/5 3.28 34108 36...Re1 37.Nh5 Qb7 38.Kg2 Bb4 >> 39.Qb2 >>0:01 2/6 5.73 116307 36...Re1 37.Qxg7+ Kxg7 38.Nh5+ >> Kh8 39.Bb2+ c3 40.Bxc3+ Qxc3 41.Rxc3 >> Re8 42.Rxb3 Re2 >>0:01 2/6 4.06 165811 36...Re7 37.Kg2 Re1 38.Nh5 Bf8 >> 39.Qc3 Qe6 40.Ne3 >>0:02 2/6 3.96 190722 36...Rxf4 37.Rxf4 Bxf4 38.Bxf4 >> c3 39.Ne5 Qc5 40.Qa8+ Qf8 >>0:04 3/7 4.00 355447 36...Rxf4 37.Rxf4 Bxf4 38.Bxf4 >> c3 39.Qd1 Qb7 40.Qd8+ Kf7 41.f3 >>0:07 3/8 4.87 709846 36...Rxf4 37.Rxf4 Bxf4 38.Bxf4 >> c3 39.Qa7 h5 40.Be5 Qg6 41.Qb8+ >> Kh7 42.Qxb3 hxg4 43.Qxc3 gxh3 44.Kxh3 >> Qh5+ 45.Kg2 >>0:32 3/8 4.76 2874367 36...Qb7 37.Bb2 h5 38.Ne3 Bxf4 >> 39.Rxf4 Rxf4 40.gxf4 Qe4 41.Bxg7 >> Qxf4+ 42.Kg1 >>0:54 3/8 4.71 4928413 36...Bxf4 37.Bxf4 Re6 38.Ne5 Qd5 >> 39.Kg2 Rb6 40.Qb2 >>1:41 4/9 5.06 9349513 36...Bxf4 37.Bxf4 Re6 38.Ne5 Qd5 >> 39.Kg2 Re7 40.Qc1 Rc7 41.Qb2 >> >>ouch.... I don't feel so bad now when I hang a pawn.... ;-) >> >>jm > >14.4 million positions and a search depth of 4 ply? What am I missing? a lot of extension and a different definition. I believe that the real depth is 9 The meaning of 4 is probably brute force depth with no null move pruning and no other pruning. The meaning of 9 is probably the real depth when chessmaster used only the null move algorithm to prune. The fact that usually in endgame I see x/x+1 numbers and not x/x+5 supports my opinion because I see no reason to prune less in the endgame (The opposite-endgame are the best candidate for more pruning rules unless you talk about null move pruning) Note that I did not write chessmaster so I do not know if my guess is correct. Uri
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