Author: Timothy J. Frohlick
Date: 14:29:07 10/08/00
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On October 08, 2000 at 13:55:25, Arturo Ochoa wrote: >Hello: > >I'm building a specific Test Chess Suite based on the difficult strategic chess >theme of the pawn positional sacrifice. > >This position, as I said previously, comes from one game of the 1999 Sarajevo >Tournament between Alexander Morozevich (2723) and Alexei Shirov (2726). >Alexander Morozevich sacrified a pawn spectacularly in the move forty. I am >really wondered how Morozevich found this move. > >[D] 4r1k1/2pn1p2/1p3qp1/1P1Pb2p/2P4P/2B2BP1/2Q2PK1/3R4 w - - > > >According to Timothy J. Frohlick, Gambit Tigers got the position in only 2½ >minutes. > >He said : "Gambit Tiger 0.95 on a 333 PII with 24 Mb Hash finds the correct move >after 2 minutes and 30 seconds. d6 cxd6 etc. Not too shabby. I think that >Gambit Tiger is a pretty strong program." > >Source: http://www.icdchess.com/forums/1/message.shtml?131688 > >He says: "I guess that Gambit Tiger 0.95 is a wizard. And I only have a PII >333Mhz 64M Ram machine". > >Source: http://www.icdchess.com/forums/1/message.shtml?131689 > >I repeated the analysis process and my results were completely different from >the Timothy's ones. > >For example: >Fritz6a only considers 40.Re1 after one hour of analysis. > >Gambit Tiger only considers 40. Re1 after thirty eight minutes. Look: >0:0:38:30.8 1.52 18 1060611375 Re1 Re7 Bd2 Qd6 Qa4 Nc5 Qa8 Kg7 Qc6 f5 Re3 Rf7 >Qxd6 cxd6 Ra3 Bd4 Bf4 Be5 Bg5. > >As you can see, Gambit Tiger never consider the move 40. d6!! after 1 hour with >47 minutes. > >However, Tiger 12.95b got the position in thirty minutes! >0:0:30:05.6 2.56 17 289975486 d6 cxd6 Bd2 Qe6 Bd5 Qg4 Bg5 Kg7 Re1 Rc8 Qa2 Qf5 >Re3 f6 >0:0:30:05.6 2.75 18 609564548 d6 cxd6 Bd2 Qe6 Bd5 Qg4 Bg5 Kg7 Re1 Rc8 Qa2 Qf5 >Re3 f6 Rf3 Qg4 > >Tiger12.95 not only gots the correct move in thirty minutes, but also it keeps >this variation for a ply of 15 moves. > >I used a PC with the following configuration: >PIII-600MHz. >Windows ME >CP5b. >I used 96Mb of Hash Tables for both Tiger12.95b and Gambit0.95b. > >I have tested other Chess Programs, but the only one that got the move in that >position was Tiger 12.95b. > >For my criterion, Tiger 12.95b "unbderstands" the position much better than >Gambit Tiger and others. > >The complete .EPD line is: > >4r1k1/2pn1p2/1p3qp1/1P1Pb2p/2P4P/2B2BP1/2Q2PK1/3R4 w - - bm d5d6;c0 Alexander >Morozevich (2723) - Alexei Shirov (2726);c1 Sarajevo 19.05.1999;eco C42;id Pawn >Positional Sacrificied Pos 1; > >The Complete Game is: > >[Event "Sarajevo"] >[Site "?"] >[Date "1999.05.19"] >[Round "3"] >[White "Morozevich, Alexander"] >[Black "Shirov, Alexei"] >[Result "1-0"] >[ECO "C42"] >[WhiteElo "2723"] >[BlackElo "2726"] >[PlyCount "113"] >[EventDate "1999.05.17"] > >1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6 7. O-O Be7 8. c4 >Nb4 9. Be2 O-O 10. Nc3 Bf5 11. a3 Nxc3 12. bxc3 Nc6 13. cxd5 Qxd5 14. c4 Qd6 >15. Be3 Bf6 16. Ra2 Rad8 17. d5 Na5 18. Nd4 Bd7 19. a4 Rfe8 20. Nb5 Bxb5 21. >axb5 b6 22. Bd2 Nb7 23. Rxa7 Nc5 24. Bf3 Be5 25. g3 Qf6 26. Kg2 Re7 27. h4 h6 >28. Qc2 Rde8 29. Re1 Bd6 30. Rxe7 Qxe7 31. Qf5 g6 32. Qb1 h5 33. Bg5 Qe5 34. Ra3 >Qd4 35. Qc2 Nd7 36. Rd3 Qa1 37. Rd1 Qe5 38. Bd2 Qf6 39. Bc3 Be5 40. d6 cxd6 41. >Bd2 Qe6 42. Bd5 Qg4 43. Bg5 Kg7 44. Re1 Rc8 45. Qa2 Qf5 46. Re3 f6 47. Rf3 Qg4 >48. Bf4 Re8 49. Qa7 Re7 50. Qc7 Kh7 51. Bxe5 dxe5 52. Qd6 Rg7 53. Bc6 Qd4 54. >Rd3 Qxd6 55. Rxd6 Nc5 56. Rxf6 Ra7 57. Bd5 1-0 > >Alternative variations to the game main line would be: > >1) If 40. ... Bxc3 41.dxc7 Nc5 42. Qxc3 Qxc3 43. Rd8 >2) If 41...Ad4 42.Ab7 Ce5 42.Dxc3 > > >Best Regards, Arturo Ochoa.
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