Author: John Merlino
Date: 19:43:28 06/12/01
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On June 12, 2001 at 10:22:52, Jon Dart wrote: >Here are a couple of positions from recent Arasan games: > >[D] 1n2r3/5Nk1/p4b2/2Qp3p/6p1/P5P1/P1B1q1PP/6RK b - - > >Here taking the piece with Kxf7 is fatal. It appears >however that after Be7! Black doesn't have anything better >than a draw. It takes CM8000, on a PIII-600, 52 seconds to see the draw with Be7: Time Depth Score Positions Moves 0:00 1/4 -0.69 8273 1...Kxf7 2. Qxd5+ Qe6 3. Qxh5+ Kg8 4. Qh7+ Kf8 5. Rf1 0:00 2/5 -0.79 23576 1...Kxf7 2. Qxd5+ Kg7 3. Qxh5 Kf8 4. Qh6+ Bg7 5. Qf4+ Kg8 0:00 2/6 -0.46 50737 1...Kxf7 2. Qxd5+ Kg7 3. Qxh5 Kf8 4. Bf5 Qxa2 5. Qxg4 Qxa3 0:02 3/7 0.00 201443 1...Kxf7 2. Qxd5+ Qe6 3. Qxh5+ Kf8 4. Bb3 Qd7 5. Rf1 Qg7 6. Qc5+ Re7 7. Qc8+ Re8 8. Qc5+ 0:07 3/8 0.00 523948 1...Kxf7 2. Qxd5+ Qe6 3. Qxh5+ Kf8 4. Bb3 Qd7 5. Rf1 Qg7 6. Qc5+ Re7 7. Qc8+ Re8 8. Qc5+ 0:21 4/9 0.60 1707969 1...Kxf7 2. Qxd5+ Kg7 3. Qxh5 Kf8 4. Bb3 Qe7 5. Qxg4 Qh7 6. Rf1 Nd7 7. Be6 0:52 4/9 0.00 4072392 1...Be7 2. Qd4+ Bf6 3. Qxd5 Qxc2 4. Nd6 Rf8 5. Qxh5 Qg6 6. Nf5+ Kf7 7. Nd6+ Kg7 1:19 5/10 0.00 6276981 1...Be7 2. Qd4+ Bf6 3. Qxd5 Qxc2 4. Nd6 Rf8 5. Qxh5 Qg6 6. Nf5+ Kf7 7. Nd6+ Kg7 > >This one is an opening trap sprung by the program >"Postmodernist": > >[D] rn1qk1nr/ppp3pp/5p2/2bP1bB1/3p4/1Q3N2/PP2PPPP/RN2KB1R w KQkq - > >Most programs will play Qxb7, but this loses material as the >Queen can be trapped. There isn't really a good move here - >White's mistake was earlier in the game, and he's already >worse. Crafty eventually selects Bf4 (at ply 12) >with a minus score. > >This is another example where grabbing material is the >wrong choice. A human might well avoid Qxb7 on the general >rule that Queen sorties in the opening are a bad idea, >but most computers won't weight that factor heavily >enough and must discover the badness of Qxb7 by search. CM8000 discards Qxb7 after 20 seconds, and settles on Bd2 five seconds later. Time Depth Score Positions Moves 0:00 1/4 0.38 4296 1. Qxb7 Nd7 2. Bf4 Rb8 0:00 2/5 -0.24 23874 1. Bf4 Ne7 2. Qb5+ Nd7 3. Qxb7 Rb8 0:01 2/6 0.03 81558 1. Qxb7 Nd7 2. Bf4 Rb8 3. Qxc7 Qxc7 4. Bxc7 Rxb2 5. Nbd2 0:02 3/7 -0.40 157589 1. Qxb7 Nd7 2. Bf4 Rb8 3. Qxc7 Qxc7 4. Bxc7 Rxb2 5. Nbd2 Ne7 0:13 3/8 -0.40 829712 1. Qxb7 Nd7 2. Bf4 Rb8 3. Qxc7 Qxc7 4. Bxc7 Rxb2 5. Nbd2 Ne7 0:20 3/8 -0.36 1295458 1. Bc1 Ne7 2. e3 dxe3 3. fxe3 Qxd5 4. Bc4 Qe4 5. O-O 0:25 3/8 -0.04 1558058 1. Bd2 Be4 2. e3 Bxd5 3. Bc4 Ne7 4. exd4 Bxc4 5. Qxc4 0:51 4/9 -0.20 3223189 1. Bd2 Ne7 2. e3 Qxd5 3. Bc4 Qe4 4. O-O dxe3 5. Bxe3 Nd7 6. Bxc5 Nxc5 2:12 4/10 0.02 8824265 1. Bd2 Ne7 2. e3 Qxd5 3. Bc4 Qe4 4. O-O Nbc6 5. Qxb7 Rb8 5:29 5/11 -0.14 23377967 1. Bd2 Ne7 2. e3 Qxd5 3. Bc4 Qe4 4. O-O dxe3 5. Bxe3 Bxe3 6. fxe3 Nd7 jm
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