Author: Dann Corbit
Date: 15:02:03 09/27/01
Go up one level in this thread
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. After b4, I think Qf2 is white's best move. It's still bad, but not a clear loser like Qxb4. From what I have seen so far, all the programs I have tested snack on the pawn and have no idea of the trouble in store. They have a big, fat, positive eval after taking the pawn, even after a nice long think about it. A terrific test position! Actually several of them. (bm b4, am Qxb4... maybe more!)
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