Author: Richard Pijl
Date: 07:45:18 11/21/02
Go up one level in this thread
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. ;) > Baron finds Bxe6 in 58 seconds with a draw score on a mobile pentium 2 500Mhz, but cannot find 6.Qc4+ within a few hours. After forcing some more moves it eventually found it. I suspect Baron requires a search up to depth 18 or 19. In this position (and on this hardware) that almost takes eternity (well, probably around a year or so). Richard.
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