Author: Uri Blass
Date: 17:33:35 09/27/01
Go up one level in this thread
On September 27, 2001 at 18:59:13, Roy Eassa wrote: >On September 27, 2001 at 18:47:57, Roy Brunjes wrote: > >>On September 27, 2001 at 17:07:23, Andy Serpa wrote: >> >>>I am intrigued by this position from an old book: >>> >>>[D]rnb2r1k/pp1p2pp/2p1P3/2q1p3/2B3Q1/2N4P/PPP3P1/R1B4K w - - 0 1 >>> >>> >>>In the book, White saves himself with the following manoeuvre: >>> >>>1. b4 Qxb4 2. Rb1 Qxc3 3. Bh6 gxh6 4. e7 Re8 5. Rf1 >>>and white mates in a few moves. >>> >>> >>>I'm curious what a fast computer comes up with in this position... >> >>Junior 7 sees a mate in 12 in 31 seconds on my Athlon 700MHz (256 MB hash). >> >>Brunjes,R - Junior 7 >>rnb2r1k/pp1p2pp/2p1P3/4p3/2B3Q1/2q4P/P1P3P1/1RB4K w - - 0 1 >> >>Analysis by Junior 7: >> >>1.exd7 Qe1+ 2.Kh2 Nxd7 >> -+ (-4.79) Depth: 3 00:00:00 >>1.e7 Re8 2.Bg5 Qxc2 >> -+ (-2.86) Depth: 3 00:00:00 2kN >>1.e7 Re8 2.Bb2 Qa5 3.Rf1 Qb4 4.Bxe5 Rxe7 >> -+ (-2.90) Depth: 6 00:00:00 14kN >>1.e7! >> -+ (-2.60) Depth: 9 00:00:00 166kN >>1.e7 Re8 2.Bg5 Qa3 3.Qh4 d5 4.Bd3 e4 >> -+ (-2.32) Depth: 9 00:00:01 466kN >>1.e7! >> -+ (-2.02) Depth: 12 00:00:09 3906kN >>1.e7! Re8 2.Bh6 gxh6 3.Rf1 Qa3 4.Rf7 Qc1+ 5.Kh2 Qg5 6.Qe4 Qf4+ 7.Rxf4 d5 8.Rf8+ >>Kg7 9.Qxe5+ Kg6 10.Bd3+ >> +- (#12) Depth: 12 00:00:31 14502kN >>1.e7 Re8 2.Bh6 gxh6 3.Rf1 Qa3 4.Rf7 Qc1+ 5.Kh2 Qg5 6.Qe4 Qf4+ 7.Rxf4 d5 8.Rf8+ >>Kg7 9.Qxe5+ Kg6 10.Bd3+ >> +- (#12) Depth: 12 00:00:32 14861kN > > >You aren't starting from the diagrammed position, are you? Because Black can >play 1...Qxe7. > >Thus I assume you're starting from move 3, following 1. b4 Qxb4 2. Rb1 Qxc3. yes he started after 1.b4 Qxb4 Rb1 Qxc3. It is not clear if b4 is winning. Junior7's opinion after 1.b4 on p200 is a small advantage for white but even if it is proved that b4 is winning you need to prove that white has no alternatives win before claiming that b4 is the best move. New position [D]rnb2r1k/pp1p2pp/2p1P3/2q1p3/1PB3Q1/2N4P/P1P3P1/R1B4K b - - 0 1 Analysis by Junior 7: 1...Qxb4 2.Bd2 dxe6 -+ (-2.10) Depth: 3 00:00:00 1...Qxb4 2.Bd2 b5 3.Be2 Qxg4 4.Bxg4 -+ (-2.06) Depth: 6 00:00:00 6kN 1...Qxb4 2.Bd3 Qxg4 3.hxg4 dxe6 4.Ba3 Rf4 5.Rf1 Rxg4 -+ (-1.87) Depth: 9 00:00:01 218kN 1...Qxb4 2.Bd3 Qxg4 3.hxg4 dxe6 4.Ba3 Rf4 5.Rf1 Rxf1+ 6.Bxf1 Nd7 7.Ne4 -+ (-1.98) Depth: 12 00:00:35 4705kN 1...Qxb4 2.Rb1 Qc5 3.Be3 Qa3 4.Bc1 = (0.00) Depth: 13 00:03:10 25572kN 1...Qd6 2.Qh4 dxe6 3.Bd3 e4 4.Qxe4 g6 5.Bh6 Rf7 6.Qe3 Nd7 ³ (-0.28) Depth: 13 00:04:10 33675kN 1...Qd6 2.Qh4 dxe6 3.Bd3 e4 4.Qxe4 g6 5.Bh6 Rf7 6.Rd1 Rf2 7.Qe3 ³ (-0.32) Depth: 14 00:05:25 42102kN 1...Qd6 2.Ne4 Qxb4 3.Qg3 Qxc4 4.Bh6 gxh6 5.Qxe5+ Kg8 6.Qg3+ Kh8 = (0.00) Depth: 15 00:10:11 72935kN 1...Qd6 2.Ne4 Qxb4 3.Qg3 Qxc4 4.Bh6 gxh6 5.Qxe5+ Kg8 6.Qg3+ Kh8 = (0.00) Depth: 16 00:17:05 118255kN 1...Qd6 2.Ne4 Qxb4 3.Qg3 Qxc4 4.Bh6 gxh6 5.e7 Qf7 6.exf8Q+ Qxf8 7.Qxe5+ Kg8 8.Nf6+ Kh8 9.Ne8+ Kg8 10.Qg3+ Kh8 = (0.13) Depth: 17 00:30:44 207892kN 1...Qd6 2.Ne4 Qxb4 3.Qg3 Qxc4 4.Bh6 gxh6 5.e7 Qf7 6.exf8Q+ Qxf8 7.Qxe5+ Kg8 8.Nf6+ Kh8 9.Ne8+ Kg8 10.Nc7 c5 = (0.24) Depth: 18 01:05:32 440051kN Uri
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.