Author: John Merlino
Date: 16:27:13 10/03/02
Go up one level in this thread
On October 02, 2002 at 14:43:34, John Merlino wrote: >On October 01, 2002 at 22:39:38, Jim Monaghan wrote: > >>On October 01, 2002 at 21:41:34, John Merlino wrote: >> >>In the first position John, the Black rook sacrifice is non-forcing. White does >>not have to take it and can instead reply 54.Qb2!? to oppose queens and possibly >>take some wood off, and also to at least cover some dark squares which White is >>weak on. Black looks like he definitely has the initiative with the more >>comfortable position, but it's definitely another matter to prove that his >>"attack" will penetrate the White position to convert his edge to the full >>point. I played around with the resulting position with various engines and >>could find nothing conclusive. Black seems a bit better, but that's about it. >>This White queen move becomes important for the analyst, especially if Susan >>Polgar believes the position is a Black win after a White acceptance of the rook >>sac. >> >>[D] 8/p1p5/Pp1p2nk/1P1Bq1r1/2P1Pp1p/6r1/1Q3RPP/3R3K b - - 0 54 >> >>Cheers, >>Jim > >You are, of course, correct. Although CM never considered NOT taking the rook >during the game. I will run the position on the P4 overnight and see what it >comes up with. > >jm I have let our P4-2.66 run on this position for 28 hours, and here is what it came up with: Time Depth Score Positions Moves 0:00 1/3 5.13 1146 54.hxg3 hxg3 55.Rfd2 Qe7 0:00 1/4 5.00 2484 54.hxg3 hxg3 55.Rfd2 Rh5+ 56.Kg1 Qe7 0:00 1/5 4.64 10185 54.hxg3 hxg3 55.Rf3 Rh5+ 56.Kg1 Qe7 57.Kf1 0:00 1/6 4.91 42212 54.hxg3 hxg3 55.Rfd2 Rh5+ 56.Kg1 Qe7 57.Qf3 Qh4 58.Kf1 Qh1+ 59.Ke2 0:00 1/7 4.10 69679 54.hxg3 hxg3 55.Rfd2 Rh5+ 56.Kg1 Qe7 57.Kf1 Ne5 58.Qc3 Rh1+ 59.Ke2 0:00 1/8 3.95 121016 54.hxg3 hxg3 55.Rb2 Rh5+ 56.Kg1 Qe7 57.Kf1 Ne5 58.Qc3 Rh1+ 59.Ke2 Rh2 0:01 1/9 1.91 517553 54.hxg3 hxg3 55.Rfd2 Rg4 56.Kg1 Qh5 57.Kf1 Qh1+ 58.Ke2 Qxg2+ 59.Kd3 Ne5+ 60.Kc2 0:02 1/10 2.17 776011 54.hxg3 hxg3 55.Rfd2 Rg4 56.Kg1 Qh5 57.Kf1 Qh1+ 58.Ke2 Qxg2+ 59.Kd3 Qf3+ 60.Kc2 Qxb3+ 61.Kxb3 f3 0:09 2/11 0.72 2735823 54.hxg3 hxg3 55.Rf3 Rg4 56.Kg1 Qh5 57.e5 Qh2+ 58.Kf1 Qh1+ 59.Ke2 Qxg2+ 60.Ke1 Rg5 61.Rd2 Rxe5+ 62.Kd1 Qh1+ 63.Kc2 0:19 3/12 0.34 5431609 54.hxg3 hxg3 55.Rf3 Rg4 56.Kg1 Qh5 57.Kf1 Qh1+ 58.Ke2 Qxg2+ 59.Ke1 Qh2 60.e5 g2 61.Rh3+ Nh4 62.Bxg2 Qxg2 63.exd6 1:34 4/13 0.56 26200821 54.hxg3 hxg3 55.Ra2 Rg4 56.Kg1 Qh5 57.Kf1 Qh1+ 58.Ke2 Qxg2+ 59.Kd3 Ne5+ 60.Kc3 Qf3+ 61.Kb2 g2 62.Raa1 Qf2+ 63.Qc2 Qe3 3:25 5/14 0.63 58517496 54.hxg3 hxg3 55.Ra2 Rg4 56.Kg1 Qh5 57.Kf1 Qh1+ 58.Ke2 Qxg2+ 59.Kd3 Ne5+ 60.Kc3 Qf3+ 61.Kb4 g2 62.Rg1 Qxb3+ 63.Kxb3 Rg3+ 64.Ka4 f3 65.Rd2 14:43 6/15 -0.28 255650469 54.hxg3 hxg3 55.Ra2 Rh5+ 56.Kg1 Rh4 57.Kf1 f3 58.Qxf3 Rf4 59.Rf2 Rxf3 60.Rxf3 Qh5 61.Ke1 Qh1+ 62.Rf1 Qxg2 63.e5 1:04:33 7/16 -0.42 1073493321 54.hxg3 hxg3 55.Ra2 Rh5+ 56.Kg1 Rh4 57.Kf1 f3 58.Qxf3 Rf4 59.Rf2 Qg5 60.e5 Rxf3 61.Rxf3 Nxe5 62.Rf8 Qe3 63.Be6 5:38:26 8/17 -0.11 1473843047 54.hxg3 hxg3 55.Rf3 Rg4 56.Kg1 Qh5 57.e5 Nxe5 58.Qc3 Qh2+ 59.Kf1 Qh1+ 60.Ke2 Qxg2+ 61.Ke1 Qh2 62.Rd2 Qh4 63.Rg2 Nxf3+ 64.Qxf3 Rg7 65.Be4 Qh1+ 66.Ke2 12:33:56 9/18 -0.45 103126968 54.hxg3 hxg3 55.Rf3 Rg4 56.Kg1 Qh5 57.e5 Rg5 58.Qc3 Qh2+ 59.Kf1 Qh1+ 60.Ke2 Qxg2+ 61.Kd3 Rxe5 62.Kd4 Ne7 63.Be4 Qe2 64.Rh1+ Kg5 65.Rxg3+ fxg3 66.Qxg3+ Kf6 67.Rh6+ Kf7 68.Bg6+ Nxg6 69.Qxg6+ However, after 54.Qb2, as you suggest, a relatively short search says this: Time Depth Score Positions Moves 0:00 1/3 0.43 993 54...Qxb2 55.Rxb2 Ra3 56.Rf2 0:00 1/4 0.49 2511 54...Qxb2 55.Rxb2 Re3 56.Rf2 Kg7 0:00 1/4 0.48 4250 54...Re3 55.Qxe5 Rxe5 56.Rfd2 Re8 0:00 1/5 0.54 9449 54...Re3 55.Qxe5 dxe5 56.Rfd2 Ne7 0:00 1/5 -0.06 11852 54...Qxb2 55.Rxb2 Re3 56.Rf2 h3 57.gxh3 Rxh3 0:00 1/6 -0.07 21344 54...Qxb2 55.Rxb2 Re3 56.Rbd2 Ne5 57.Rf1 h3 0:00 1/7 -0.05 61674 54...Qxb2 55.Rxb2 Re3 56.Rf2 h3 57.gxh3 Rxh3 58.Be6 Re3 59.Bf5 0:00 1/8 -0.05 105112 54...Qxb2 55.Rxb2 Re3 56.Rf2 h3 57.gxh3 Rxh3 58.Be6 Re3 59.Bf5 0:01 1/9 -0.25 236443 54...Qxb2 55.Rxb2 Re3 56.Rf2 h3 57.gxh3 f3 58.Rfd2 Re2 59.Rxe2 fxe2 0:02 1/10 -0.26 525935 54...Qxb2 55.Rxb2 Re3 56.Rf2 h3 57.gxh3 f3 58.Be6 Rxe4 59.Bd5 Rf4 60.Bxf3 Rxc4 0:05 2/11 -0.54 1378737 54...Qxb2 55.Rxb2 Re3 56.Rf2 h3 57.gxh3 f3 58.h4 Nxh4 59.Rdf1 Re2 60.Rxe2 fxe2 0:16 3/12 -0.55 4581082 54...Qxb2 55.Rxb2 Re3 56.Rf2 h3 57.gxh3 f3 58.Be6 Ne5 59.h4 Rg7 60.Bf5 Re2 61.Rxe2 fxe2 0:46 4/13 -0.67 13427568 54...Qxb2 55.Rxb2 Re3 56.Rbd2 Ne5 57.Rc2 h3 58.gxh3 Rxh3 59.Be6 Re3 60.Bf5 Rg7 61.Rf2 f3 3:00 5/14 -0.82 53118189 54...Qxb2 55.Rxb2 Re3 56.Rf1 h3 57.gxh3 f3 58.Rbf2 Ne5 59.h4 Rh5 60.Kg1 Rxh4 61.Rd2 Rg4+ 62.Kf2 Rb3 9:19 6/15 -0.91 172459458 54...Qxb2 55.Rxb2 Re3 56.Rf1 h3 57.gxh3 f3 58.Rbf2 Ne5 59.Be6 Rxe4 60.Bd5 Rf4 61.Bxf3 Rgf5 62.Kg2 Rxc4 39:33 7/16 -0.84 732706828 54...Qxb2 55.Rxb2 Rc3 56.Rf2 h3 57.gxh3 f3 58.Be6 Ne5 59.Re1 Nxc4 60.Bxc4 Rxc4 61.Rxf3 Rxb5 62.Rf8 Rbc5 63.Rg1 Rg5 64.Rh8+ Kg6 65.Rxg5+ Kxg5 jm
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