Author: Thomas Lagershausen
Date: 16:17:46 01/19/01
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On January 19, 2001 at 19:07:12, Dann Corbit wrote: >On January 19, 2001 at 18:30:14, Dann Corbit wrote: > >>On January 19, 2001 at 15:31:11, Thomas Lagershausen wrote: >> >>>In the following game white has a winning knightsacrifice after the important >>>pawnmoves 15.b4! and 16.b5!.Is a program able to find the plan? >>> >>>[Event "40/120"] >>>[Site "?"] >>>[Date "1992.11.25"] >>>[Round "4"] >>>[White "Lagershausen"] >>>[Black "Fidelity Avantgard#6"] >>>[ECO "A21"] >>>[Result "1-0"] >>> >>>1. c4 e5 2. Nc3 Nc6 3. Nf3 d6 4. d4 Bg4 5. d5 Nce7 6. e4 >>>Ng6 7. Be2 Nf4 8. Bxf4 exf4 9. Nd4 Bd7 10. Bg4 Ne7 11. O-O >>>Qc8 12. Bxd7+ Qxd7 13. Qb3 O-O-O 14. Qa3 Kb8 15. b4 g6 >>>16. b5 Bg7 17. Nc6+ bxc6 18. bxc6 Nxc6 19. Rab1+ Ka8 >>>20. Nb5 Bd4 21. dxc6 Qxc6 22. Nxd4 Qd7 23. Qa6 c5 24. Nb5 >>>Rb8 25. Nc3 f5 26. Nd5 fxe4 27. Nb6+ Rxb6 28. Rxb6 Qc8 >>>29. Qa4 Qe8 30. Qxe8+ Rxe8 31. Rxd6 1-0 >> >>Here is the position in question: >>[D]1k1r1b1r/pppqnppp/3p4/3P4/2PNPp2/Q1N5/PP3PPP/R4RK1 w - - bm b4; > >Crafty would pick b4 on a fast machine at tournament time controls: But he fails to find the right intention of 15.b4.To have the winning sacrifice 17.Nc6+ white needs to play 16.b5 to open the b-file and have a pawn on c6.After the best defence 16..Ka8! white improves his position with Rab1 and the idear Rb4 and Ra4. b1 with>White(1): epdpfga langer.epd langer.out >PFGA: EPD record: 1 ID: Lagershausen/Fidelity Avantgard#6 >middle-game phase > clearing hash tables > time surplus 0.00 time limit 10:00 (10:00) > nss depth time score variation (1) > 6-> 0.28 0.33 1. Qb4 a6 2. c5 dxc5 3. Qxc5 Nf5 4. > Qc4 Nxd4 5. Qxd4 > 7 0.65 0.35 1. Qb4 a6 2. Nce2 g5 3. c5 Bg7 4. cxd6 > Qxd6 > 7-> 0.80 0.35 1. Qb4 a6 2. Nce2 g5 3. c5 Bg7 4. cxd6 > Qxd6 > 8 1.96 0.34 1. Qb4 Ka8 2. Nb3 b6 3. Nd4 a6 4. h3 > Re8 > 8-> 2.31 0.34 1. Qb4 Ka8 2. Nb3 b6 3. Nd4 a6 4. h3 > Re8 > 9 9.13 0.35 1. Qb4 g5 2. Rad1 Bg7 3. c5 dxc5 4. > Qxc5 Qd6 5. Qc4 c6 > 9 11.19 0.40 1. c5 dxc5 2. Qxc5 Ng6 3. Qa5 Ne5 4. > Nce2 b6 5. Qd2 g5 > 9-> 13.05 0.40 1. c5 dxc5 2. Qxc5 Ng6 3. Qa5 Ne5 4. > Nce2 b6 5. Qd2 g5 > 10 16.77 0.41 1. c5 dxc5 2. Qxc5 Nf5 3. Qc4 Nxd4 > 4. Qxd4 f6 5. Rac1 Bd6 6. Qc4 Rhe8 > 10-> 22.24 0.41 1. c5 dxc5 2. Qxc5 Nf5 3. Qc4 Nxd4 > 4. Qxd4 f6 5. Rac1 Bd6 6. Qc4 Rhe8 > 11 34.10 0.46 1. c5 dxc5 2. Qxc5 Ng6 3. Qa5 Ne5 4. > Nce2 Re8 5. f3 Nc4 6. Qb5 Qxb5 7. Nxb5 > 11-> 54.39 0.46 1. c5 dxc5 2. Qxc5 Ng6 3. Qa5 Ne5 4. > Nce2 Re8 5. f3 Nc4 6. Qb5 Qxb5 7. Nxb5 > 12 1:21 0.42 1. c5 dxc5 2. Qxc5 Nf5 3. Qc4 Nxd4 > 4. Qxd4 f6 5. Rac1 Bd6 6. Qc4 Qe7 7. > Nb5 Rhe8 > 12 4:01 0.48 1. b4 g5 2. c5 Bg7 3. Rad1 dxc5 4. > bxc5 h5 5. Ndb5 a6 6. c6 Qe8 7. Nd4 > bxc6 > 12-> 4:01 0.48 1. b4 g5 2. c5 Bg7 3. Rad1 dxc5 4. > bxc5 h5 5. Ndb5 a6 6. c6 Qe8 7. Nd4 > bxc6 > 13 6:07 0.50 1. b4 g5 2. c5 Bg7 3. Rad1 dxc5 4. > bxc5 Rhe8 5. Ndb5 Nc8 6. Rb1 Bxc3 7. > Nxc3 Qe7 8. f3 > time=10:00 cpu=99% mat=0 n=302680686 fh=90% nps=503921 > ext-> checks=8052498 recaps=1263023 pawns=577039 1rep=988288 >thrt:83432 > predicted=0 nodes=302680686 evals=74756074 > endgame tablebase-> probes done=0 successful=0
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