Author: Ernst Walet
Date: 23:54:57 11/20/02
Go up one level in this thread
On November 20, 2002 at 20:54:28, John Merlino wrote: >On November 20, 2002 at 18:34:45, Andreas Guettinger wrote: > >>Do you think the tactical abilities of you engine are sufficient? Here a >>position from the game Boleslawski-Flohr to test the computers. >> >> >> >>[Event "Ch URS"] >>[Site "Moscow (Russia)"] >>[Date "1950.??.??"] >>[Round "?"] >>[White "Boleslavsky Isaak (BLR)"] >>[Black "Flohr Salomon (RUS)"] >>[Result "1-0"] >>[ECO "B11"] >> >>1.e4 c6 2.Nc3 d5 3.Nf3 Bg4 4.h3 Bxf3 5.Qxf3 e6 6.d4 Nf6 7.Bd3 dxe4 8.Nxe4 Qxd4 >>9.Be3 Qd8 10.O-O-O Nbd7 11.Bc4 Qa5 12.Bd2 Qb6 13.Rhe1 Nxe4 14.Rxe4 Nf6 15.Bxe6 >>fxe6 16.Rxe6+ Be7 17.Rde1 Nd5 18.Bg5 O-O-O 19.Bxe7 Nxe7 20.Rxe7 Rhf8 21.Qg4+ >>Kb8 22.Qxg7 Qxf2 23.b3 Rg8 24.Qxh7 Rxg2 25.Rxb7+ Ka8 26.Rbe7 Qc5 27.h4 a5 28. >>Re8 Qd4 29.Kb1 Rd2 30.Rxd8+ Qxd8 31.Qe4 Qf6 32.h5 1-0 >> >>Position after the move 14. ... Nf6: >> >>[D] r3kb1r/pp3ppp/1qp1pn2/8/2B1R3/5Q1P/PPPB1PP1/2KR4 w kq - >> >>Does your computer see the win for white here? (Draw by repetition is not >>sufficient.) >> >>1. Bxe6 fe 2. Rxe6+ Be7 3. Rde1 0-0 4. Rxe7 Nd5 5. Rxg7+!! Kxg7 6. Bc3+ Nxc3 7. >>Re7+ +- >> >>3. .... Nd5 4. Bg5 0-0-0 5. Bxe7 Nxe7 6. Rxe7 +- >> >>2. ... Kf7 3. Rxf6 gf 4. Qh5+ Kg8 5. Qg4+ Kf7 6. Qc4+ Kg6 7. Qe4+ Kf7 8. Ba5 >>Bh6+ (8. ... Qc5 9. Rd7+ Be7 10. Bb4 Qe5 11. Rxe7+ +-) 9. Kb1 Rad8 10. Qc4+ Kg7 >>11. Qg4+ Kf7 12. Bxb6 Rxd1+ 13. Qxd1 +- >> >> >>Time to improve your extensions? Seems to me some engines get confused by the >>repetitions. Let's see. ;) >> >> >>regards >>Andreas >> >>(analysis courtesy from "Erfolgreiche Schachlehre", David Bronstein) > >On my P3-733, it takes CM9000 59 seconds to find Bxe6, but it only gives it a >drawing score. That is at depth 9. After a little bit of move-forcing, it >appears that CM9000 would have to get to at least depth 18 to see the win, and >that is a long way off. > >The problem, of course, is finding that 6.Qc4+ is better than a repetition draw. >If I force all the way to 4.Qh5+ (nine plies), it still takes 56 seconds to see >the win. > >jm With SS=12 it takes CM9K 13 ply to see 6.Qc4+ and give Bxe6 a plus score. Time Depth Score Positions Moves 0:01 1/6 0.14 167203 1.Re2 O-O-O 2.Qc3 Qd4 3.Rde1 Qxc3 4.Bxc3 0:01 1/6 0.23 179197 1.Ree1 Bb4 2.c3 Bc5 3.Re2 O-O 4.Bf4 0:02 1/7 0.06 357350 1.Ree1 Be7 2.Bc3 O-O 3.Kb1 Rad8 4.Qg3 Qc5 0:04 1/7 0.13 674866 1.Re5 Qd4 2.Qe2 O-O-O 3.c3 Qb6 4.Rg5 Qc7 0:07 1/8 0.17 1055089 1.Re5 Qd4 2.Qe2 O-O-O 3.c3 Qb6 4.Rg5 Qc7 5.Kb1 0:08 1/8 0.28 1309486 1.Ree1 Be7 2.Qg3 O-O 3.Be3 Qa5 4.Bh6 Nh5 5.Qg4 0:18 1/9 -0.14 2925368 1.Ree1 Be7 2.Qg3 O-O 3.Bc3 Rfd8 4.Kb1 Rxd1+ 5.Rxd1 Rd8 6.Rxd8+ Qxd8 7.Bd3 0:32 1/9 0.00 5277721 1.Bxe6 fxe6 2.Rxe6+ Kf7 3.Rxf6+ gxf6 4.Qh5+ Kg8 5.Qg4+ Kf7 6.Qh5+ 0:35 1/9 0.03 5769720 1.Re5 Qd4 2.Qe2 O-O-O 3.c3 Qd7 4.Kb1 Be7 5.Ra5 b5 0:58 1/10 0.06 9697994 1.Re5 Qd4 2.Qe2 O-O-O 3.c3 Qd7 4.Kb1 Bd6 5.Bf4 Qc7 2:34 1/11 -0.05 26294044 1.Re5 Qd4 2.Qe2 O-O-O 3.c3 Qd7 4.Qf3 Qc7 5.Ree1 Bd6 6.Bg5 3:52 1/11 0.00 41122514 1.Bxe6 fxe6 2.Rxe6+ Kf7 3.Rxf6+ gxf6 4.Qh5+ Kg8 5.Qg4+ Kf7 6.Qh5+ 9:16 1/12 0.00 102623635 1.Bxe6 fxe6 2.Rxe6+ Kf7 3.Rxf6+ gxf6 4.Qh5+ Kg8 5.Qg4+ Kf7 6.Qh5+ 29:55 1/13 1.04 332364905 1.Bxe6 fxe6 2.Rxe6+ Kf7 3.Rxf6+ gxf6 4.Qh5+ Kg8 5.Qg4+ Kf7 6.Qc4+ Kg6 7.Qe4+ Kf7 8.Ba5 Qc5 9.Rd7+ Qe7 10.Qd3 b6 11.Qc4+ Kg7 12.Qg4+ Kf7 13.Rxe7+ Bxe7 1:05:28 2/14 1.15 751147271 1.Bxe6 fxe6 2.Rxe6+ Kf7 3.Rxf6+ gxf6 4.Qh5+ Kg8 5.Qg4+ Kf7 6.Qc4+ Kg6 7.Qe4+ Kf7 8.Ba5 Qc5 9.Rd7+ Qe7 10.Qd3 Ke8 11.Rxe7+ Bxe7 12.g4 h5 Ernst.
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