Author: John Merlino
Date: 11:13:13 08/16/04
Go up one level in this thread
On August 16, 2004 at 13:11:21, Albert Silver wrote: >[D]r1r3k1/3b1pp1/pp2p2p/n2pP3/P2P3Q/2qB4/2P2PPP/RRB3K1 w - - 0 24 > >Interestingly enough, Junior 8 never saw this one coming, and after testing it a >bit, I noted that some engines see it quite easily and others not. The move is >24.Bxh6! giving white a very strong attack. Note that the engine has to show it >really holds this. CM9_SKR on an AMD 2500 finds 24.Bxh6 immediately: Time Depth Score Positions Moves 0:00 1/3 0.60 1714 24.Bb2 Qb4 25.Ba3 0:00 1/3 2.37 5938 24.Bxh6 gxh6 25.Qxh6 Be8 26.Bh7+ Kh8 27.Bf5+ Kg8 28.Qh7+ Kf8 29.Qh8+ Ke7 30.Rxb6 0:00 1/4 1.90 13725 24.Bxh6 gxh6 25.Qxh6 Be8 26.Rd1 Nc4 0:00 1/5 2.06 37118 24.Bxh6 gxh6 25.Qxh6 Be8 26.Rd1 Nc4 27.Bh7+ Kh8 28.Bf5+ Kg8 0:01 1/6 1.74 189495 24.Bxh6 gxh6 25.Qxh6 Be8 26.Rd1 Nc4 27.a5 Nxa5 0:02 1/7 1.64 401968 24.Bxh6 gxh6 25.Qxh6 Be8 26.Rd1 Nc6 27.a5 Nxd4 28.axb6 Bb5 0:05 1/8 1.18 1197141 24.Bxh6 gxh6 25.Qxh6 Be8 26.Rd1 Nc6 27.Bh7+ Kh8 28.Bf5+ Kg8 29.Rab1 Nxd4 30.Bh7+ Kh8 31.Bd3+ Kg8 32.Rxb6 Bxa4 33.Rb7 0:16 1/9 1.41 3930042 24.Bxh6 gxh6 25.Qxh6 Be8 26.Rd1 Nc6 27.Bh7+ Kh8 28.Bf5+ Kg8 29.Rab1 Nxd4 30.Bh7+ Kh8 31.Bd3+ Kg8 32.Rxb6 Rab8 33.Rxa6 Rb7 0:50 1/10 1.74 13763683 24.Bxh6 gxh6 25.Qxh6 Be8 26.Bh7+ Kh8 27.Re1 Nc4 28.Bd3+ Kg8 29.Rad1 Qb4 30.Bxc4 Rxc4 31.Re3 Rc3 1:31 1/11 1.55 26072311 24.Bxh6 gxh6 25.Qxh6 Be8 26.Bh7+ Kh8 27.Rd1 Nc4 28.Rab1 Nb2 29.Bd3+ Kg8 30.Rd2 Ra7 31.a5 Nxd3 32.Rxd3 >A couple of moves later, after 24.Bxh6 gxh6 25.Qxh6 Be8 (only move), another >good test position comes up regarding the follow-up to the attack: > >[D]r1r1b1k1/5p2/pp2p2Q/n2pP3/P2P4/2qB4/2P2PPP/RR4K1 w - - 0 26 > >The move here is 26.Rf1! There is more than one way to conduct the attack here, >and I'll admit I haven't examined them all exhaustively, but I believe bringing >the rook to f1, covering the back rank and allowing the a1 rook to join the >fray, is the most logical. The King is happy with 26.Bh7+ Kh8 27.Rd1: Time Depth Score Positions Moves 0:00 1/3 2.08 6938 26.Rd1 Nc4 27.Bh7+ Kh8 28.Bf5+ Kg8 0:00 1/4 1.74 31736 26.Rd1 Nc4 27.a5 Nxa5 0:00 1/5 1.65 139043 26.Rd1 Nc6 27.a5 Nxd4 28.axb6 Bb5 0:01 1/6 1.20 336692 26.Rd1 Nc6 27.Bh7+ Kh8 28.Bf5+ Kg8 29.Rab1 Nxd4 30.Bh7+ Kh8 31.Bd3+ Kg8 32.Rxb6 Bxa4 33.Rb7 0:03 1/7 1.43 1027021 26.Rd1 Nc6 27.Bh7+ Kh8 28.Bf5+ Kg8 29.Rab1 Nxd4 30.Bh7+ Kh8 31.Bd3+ Kg8 32.Rxb6 Rab8 33.Rxa6 Rb7 0:11 1/8 1.35 3495972 26.Rd1 Nc6 27.Bh7+ Kh8 28.Rab1 Nxd4 29.Bd3+ Kg8 30.Rxb6 Rcb8 31.Rbb1 Rxb1 32.Rxb1 0:26 1/8 1.76 7937714 26.Bh7+ Kh8 27.Re1 Nc4 28.Bd3+ Kg8 29.Rad1 Qb4 30.Bxc4 Rxc4 31.Re3 Rc3 0:56 1/9 1.59 17075932 26.Bh7+ Kh8 27.Rd1 Nc4 28.Rab1 Nb2 29.Bd3+ Kg8 30.Rd2 Ra7 31.a5 Nxd3 32.Rxd3 3:06 1/10 2.02 55147287 26.Bh7+ Kh8 27.Rd1 Rc4 28.Bd3+ Kg8 29.Bxc4 Nxc4 30.Qc1 Nb2 31.Qg5+ Kf8 32.Qh6+ Ke7 33.Qh4+ Kd7 34.Rdc1 Qd2 >[D]r1r1b1k1/5p2/pp2p2Q/3pP3/P1nP4/2qB4/2P2PPP/R4RK1 w - - 0 27 > >After 26.Rf1 Nc4 seems best, but here is a really bizarre thing: When I look at >this, the most logical follow-up to me seems to be 27.Rae1, threatening 28.Bxc4 >and 29.Re3, yet none of the engines really likes it. At least not at any >playable time-control. However, in the end, DF8 confirmed 27.Rae1 as best: Once again, The King prefers 27.Bh7+ Kh8 28.Rad1: Time Depth Score Positions Moves 0:56 1/9 1.59 17075932 26.Bh7+ Kh8 27.Rd1 Nc4 28.Rab1 Nb2 29.Bd3+ Kg8 30.Rd2 Ra7 31.a5 Nxd3 32.Rxd3 3:06 1/10 2.02 55147287 26.Bh7+ Kh8 27.Rd1 Rc4 28.Bd3+ Kg8 29.Bxc4 Nxc4 30.Qc1 Nb2 31.Qg5+ Kf8 32.Qh6+ Ke7 33.Qh4+ Kd7 34.Rdc1 Qd2 ---- ---- ---- ---- ---- 0:00 1/3 0.00 5036 26...Qxd4 27.Bh7+ Kh8 28.Be4+ Kg8 29.Bh7+ 0:00 1/4 0.41 47670 26...Qxd4 27.Rfe1 Nc4 28.Bh7+ Kh8 29.Be4+ Kg8 0:00 1/5 0.45 142185 26...Qxd4 27.Bh7+ Kh8 28.Ra3 Rc3 29.Rxc3 Qxc3 30.Be4+ Kg8 0:01 1/6 0.63 361739 26...Qxd4 27.Bh7+ Kh8 28.Rfe1 Rc3 29.Bd3+ Kg8 30.Rab1 Rxd3 31.cxd3 Qxd3 32.Rbd1 Qg6 0:04 1/7 2.54 1281796 26...Qxd4 27.Bh7+ Kh8 28.Rae1 Nc4 29.Bd3+ Kg8 30.Re3 Nxe3 31.Bh7+ Kh8 32.Bg6+ Kg8 33.fxe3 Qxe3+ 34.Qxe3 fxg6 35.Qxb6 0:09 1/7 0.91 2698603 26...Nc4 27.Bh7+ Kh8 28.a5 bxa5 29.Bd3+ Kg8 30.Rfb1 Rc7 31.Qh7+ Kf8 32.Bxc4 Rxc4 33.Qh6+ Kg8 0:18 1/8 1.11 5220216 26...Nc4 27.Rab1 Qd2 28.Qh7+ Kf8 29.Qh8+ Ke7 30.Bxc4 Rxc4 31.Rxb6 Qxd4 32.Rb7+ Kd8 33.Rxf7 ---- ---- ---- ---- ---- 0:00 1/3 1.88 6837 27.Rfd1 Qb4 28.Bh7+ Kh8 29.Bf5+ Kg8 0:00 1/3 1.96 8238 27.Rad1 Qb4 28.Bh7+ Kh8 29.Bf5+ Kg8 0:00 1/4 0.94 31034 27.Rad1 Nb2 28.Bh7+ Kh8 29.Be4+ Kg8 30.Qh7+ Kf8 31.Qh8+ Ke7 32.Qf6+ Kd7 0:00 1/4 1.03 93914 27.Bh7+ Kh8 28.Qh4 Kg7 29.a5 f6 30.axb6 Nxb6 31.exf6+ Kh8 0:00 1/5 1.49 264899 27.Bh7+ Kh8 28.Rad1 Nb2 29.Bd3+ Kg8 30.Rd2 Nxd3 31.Rxd3 0:04 1/6 1.14 1150617 27.Bh7+ Kh8 28.a5 Qxd4 29.Bd3+ Kg8 30.axb6 Qxb6 31.Bh7+ Kh8 32.Rfb1 Qd4 33.Bd3+ Kg8 0:12 1/7 1.50 3412709 27.Bh7+ Kh8 28.Rfd1 Rc7 29.Bd3+ Kg8 30.a5 bxa5 31.Bh7+ Kh8 32.Bf5+ Kg8 33.Qh7+ Kf8 34.Bxe6 fxe6 35.Qxc7 Qxc2 0:29 1/8 1.68 8529818 27.Bh7+ Kh8 28.Rad1 Nb2 29.Rde1 Nc4 30.Bf5+ Kg8 31.Qh7+ Kf8 32.Bxe6 Qxd4 33.Bxc8 Rxc8 34.Qh6+ Kg8 0:43 1/9 1.54 12805708 27.Bh7+ Kh8 28.Rad1 Nb2 29.Rde1 Nc4 30.Bf5+ Kg8 31.Qh7+ Kf8 32.Bxe6 Qxd4 33.Qh6+ Kg8 34.Bf5 Qd2 35.Qh7+ Kf8 36.Bxc8 Rxc8 37.Qh8+ Ke7 1:47 1/10 2.21 31451466 27.Bh7+ Kh8 28.Rad1 Nxe5 29.Bd3+ Kg8 30.Qh7+ Kf8 31.Qh8+ Ke7 32.dxe5 Bc6 33.Qf6+ Ke8 34.Be2 Qb4 35.a5 bxa5 36.Bh5 jm
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