Author: Robert Hyatt
Date: 15:15:51 09/27/01
Go up one level in this thread
On September 27, 2001 at 17:59:46, Uri Blass wrote: >On September 27, 2001 at 17:47:47, Robert Hyatt wrote: > >>On September 27, 2001 at 17:33:58, Roy Eassa 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... >>> >>> >>>Starting two moves in (I think it's too hard to start at the beginning), after >>>1. b4 Qxb4 2. Rb1 Qxc3: >>> >>>[D]rnb2r1k/pp1p2pp/2p1P3/4p3/2B3Q1/2q4P/P1P3P1/1RB4K w - - 0 1 >>> >>>Here's what I get with Gambit Tiger 2.0 Aggressive on an Athlon 1.2 (in 1 >>>minute, it sees it has a perpetual. In 1.5 minutes, it sees it has an >>>advantage. In 4 minutes, it sees it has a win.): >>> >>>00:00:00.8 -4.14 8 161550 Bd3 Qe1+ Kh2 Qf2 e7 Re8 Bxh7 Rxe7 Bg6 >>>00:00:00.1 -3.24 8 312659 Bd3 >>>00:00:01.7 -3.24 9 391208 Bd3 Qe1+ >>>00:00:01.4 -3.68 9 670505 Bd3 Qc5 Qh4 e4 Qxe4 Qh5 e7 Re8 Ba3 d5 >>>00:00:02.2 -3.02 9 885911 e7 Re8 Bh6 gxh6 Rf1 Qa3 Rf7 Qc1+ Kh2 Qf4+ Rxf4 exf4 >>>00:00:05.0 -2.12 10 2037930 e7 >>>00:00:06.5 -2.12 11 2496977 e7 >>>00:00:11.9 -1.60 11 4422079 e7 Re8 Bd3 d5 Qf3 Nd7 Qf7 Rxe7 Qxe7 Qc5 Qe6 Qf8 Bb2 >>>00:00:14.9 -1.60 12 5492547 e7 Re8 >>>00:00:48.3 -1.36 12 17494341 Bd3 Qe1+ Kh2 Rf1 Bxf1 Qxf1 Ba3 Qf6 e7 Qf7 Rf1 Qg8 >>>Qf5 >>>00:00:55.1 -0.70 12 20234211 Bh6 >>>00:00:57.8 -0.31 12 21078455 Bh6 gxh6 e7 Re8 Rf1 Qa3 Rf7 Qc1+ Kh2 Qg5 Rf8+ Kg7 >>>Rf7+ Kg8 Rf8+ Kg7 >>>00:01:33.7 0.59 13 35309917 Bh6 >>>00:04:00.9 3.84 13 94628156 Bh6 Rg8 e7 Qxc4 Qxc4 d5 Bxg7+ Kxg7 Qh4 Nd7 Qg5+ Kf7 >>>Rf1+ Ke6 Qxg8+ Kxe7 Rf7+ Kd6 >> >> >>I think that is too late to start searching. Qc3 probably loses. Question is, >>is there an alternative that doesn't, such as Qa3 instead. I haven't studied it >>much, but the queen at c3 is locked out of the game which is how white wins. > >Deep Fritz does not like Qxc3 > >New position >rnb2r1k/pp1p2pp/2p1P3/4p3/1qB3Q1/2N4P/P1P3P1/1RB4K b - - 0 1 > >Analysis by Deep Fritz: > >2...Qxc3 3.Qe4 dxe6 4.Bb2 Rf4 5.Bxc3 > -+ (-6.47) Depth: 5/17 00:00:00 14kN >2...Qxc3 3.Qe4 dxe6 4.Bb2 Rf4 5.Bxc3 > -+ (-6.47) Depth: 5/17 00:00:00 14kN >2...Qxc3 3.Qe4 dxe6 4.Bb2 Rf4 5.Bxc3 > -+ (-6.47) Depth: 5/17 00:00:00 14kN >2...Qxc3 3.Qe4 dxe6 4.Bb2 Rf4 5.Bxc3 > -+ (-6.47) Depth: 5/17 00:00:00 14kN >2...Qxc3 3.Qe4 dxe6 4.Bb2 Rf4 5.Bxc3 > -+ (-6.47) Depth: 5/17 00:00:00 14kN >2...Qxc3 3.Qe4 dxe6 4.Bb2 Rf4 5.Bxc3 > -+ (-6.47) Depth: 5/17 00:00:00 14kN >2...Qxc3 3.Qe4 dxe6 4.Bb2 Rf4 5.Bxc3 > -+ (-6.47) Depth: 5/17 00:00:00 14kN >2...Qxc3 3.Qe4 dxe6 4.Bb2 Rf4 5.Bxc3 > -+ (-6.47) Depth: 5/17 00:00:00 14kN >2...Qxc3 3.Qe4 dxe6 4.Bb2 Rf4 5.Bxc3 > -+ (-6.47) Depth: 5/17 00:00:00 14kN >2...Qxc3 3.Qe4 dxe6 4.Bb2 Rf4 5.Bxc3 > -+ (-6.47) Depth: 5/17 00:00:00 14kN >2...Qxc3 3.Bd3 dxe6 4.Qh4 h6 5.Be3 > -+ (-6.31) Depth: 6/19 00:00:00 42kN >2...Qxc3-- > -+ (-6.00) Depth: 7/18 00:00:00 75kN >2...Qxc3-- 3.e7 Re8 4.Bb2 Qd2 5.Rf1 Qd6 > -+ (-5.41) Depth: 7/22 00:00:00 137kN >2...Qxc3 3.e7 Re8 4.Bb2 Qd2 5.Rf1 Qd6 6.Rf8+ Rxf8 > -+ (-5.28) Depth: 8/20 00:00:00 194kN >2...Qxc3 3.e7 Re8 4.Bb2 Qa5 5.Rf1 Qb4 6.Bxe5 Qxe7 > -+ (-5.22) Depth: 9/25 00:00:00 439kN >2...Qxc3-- > -+ (-4.91) Depth: 10/22 00:00:01 547kN >2...Qxc3-- 3.e7 Re8 4.Bb2 Qb4 > -+ (-4.72) Depth: 10/30 00:00:01 908kN >2...Qxc3-- > -+ (-4.41) Depth: 11/25 00:00:02 1349kN >2...Qxc3-- 3.e7 Re8 4.Bh6 gxh6 5.Rf1 Qa3 6.Rf7 Qc1+ 7.Kh2 Qg5 8.Rf8+ > -+ (-3.53) Depth: 11/34 00:00:09 5884kN >2...Qxc3-- > -+ (-3.22) Depth: 12/28 00:00:16 10286kN >2...Qxc3-- 3.Bd3 Qe1+ 4.Kh2 Rf1 5.Bxf1 Qxf1 6.Ba3 Qf6 7.e7 Qf7 8.Re1 > -+ (-3.00) Depth: 12/38 00:00:48 30032kN >2...Qxc3 3.e7 Re8 4.Bh6 gxh6 5.Rf1 Qa3 6.Rf7 Qc1+ 7.Kh2 Qf4+ 8.Qxf4 > -+ (-3.00) Depth: 13/36 00:01:42 64410kN >2...Qxc3-- > -+ (-2.69) Depth: 14/34 00:02:00 76124kN >2...Qxc3-- 3.Bd3 dxe6 4.Qh4 Qxd3 5.cxd3 Rf1+ 6.Kh2 Kg8 7.Qg3 c5 8.Bh6 > ³ (-0.59) Depth: 14/42 00:04:57 187392kN >2...Qe7! > ³ (-0.63) Depth: 14/42 00:05:45 221054kN > >(Blass, Tel-aviv 28.09.2001) > >Uri That looks pretty reasonable. Black has to prevent the e7 tactics. That is a way to avoid the ripped kingside with the black queen out of play at c3. Very tough position, at least for my program. Mine won't play b4 in any reasonable time. It likes Be3 with a near-zero score...
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