Author: José de Jesús García Ruvalcaba
Date: 10:00:02 04/29/99
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On April 28, 1999 at 20:40:24, Hans Havermann wrote: >I'm sorry. I've lost the original thread because the new CCC server seems unable >to go back that far. However looking in the archive for when I started the >calculation (19 April), I see Jeremiah Penery (Message Number: 49164) posting: >------------------------------------------------------------------------------------------------------ >> [Event "?"] >> [Site "?"] >> [Date "1988.??.??"] >> [Round "?"] >> [White "Deep Thought"] >> [Black "Valvo"] >> [Result "0-1"] >> >> 1. e4 e5 2. f4 d5 3. exd5 c6 4. Nc3 exf4 5. Nf3 Bd6 6. d4 Ne7 7. dxc6 Nbxc6 >> 8. d5 Nb4 9. Bc4 O-O 10. a3 b5 11. Bb3 Na6 12. Nxb5 Qa5+ 13. Nc3 Nc5 14. >> Ba2 Ba6 15. b4 Qc7 16. bxc5 Rfe8 17. Ne2 Qxc5 18. c4 Nxd5 19. Qd4 Qxd4 20. >> Nxd4 Bc5 21. Kd2 Ne3 22. Kc3 Rac8 23. Bb2 Nxg2 24. Raf1 Rcd8 25. Rhg1 Re3+ >> 26. Kd2 f3 27. Rxf3 Rxf3 28. Rxg2 Rh3 29. Kc1 g6 30. a4 Bb7 31. Rf2 Ba8 32. >> Bb1 Rb8 33. Ba2 Rd3 34. Rf4 Rd2 35. Kxd2 Rxb2+ 36. Nc2 Rxa2 37. Nc3 Rb2 38. >> Rf6 Kg7 39. Rf1 f5 40. Nd5 Bxd5 41. cxd5 Rb3 42. h4 Kf6 43. Re1 Rh3 44. >> Re6+ Kf7 45. a5 Rxh4 46. Rc6 Bb4+ 47. Nxb4 Rxb4 48. Rc7+ Kf6 0-1 >> >> The analysis says that Deep Thought calculated 19 ply for its 16th move but >> was unable to find anything better than accepting the knight sacrifice. > >This was (I think) a correspondence game played on RGCC or some such. >Presumably, the move 16. bxc5 is bad - I'm wondering if any programs pick a >different move, and at what depth and time do they switch. >------------------------------------------------------------------------------------------------------ >For what it's worth, here is the MacChess analysis (running on a G3): > >07/01|000:00:02| 370038| +365| bxc5 Bxc5 Ne4 Bxa3 c4 Bb4+ Bd2 Bxd2+ Nfxd2 >08/01|000:00:06| 1422725| +356| bxc5 Rae8 Ne4 Nf5 Nd2 Qxc5 c4 Qe3+ Qe2 Bxa3 >Bxa3 Qxa3 >09/01|000:00:22| 5254035| +259| bxc5 Rae8 Kd2 Qxc5 Qg1 Qe3+ Qxe3 fxe3+ Ke1 >e2 Bb2 >10/01|000:02:04| 30680613| +182| bxc5 Rae8 Ne4 Nc8 Nd2 Qxc5 c4 f5 Qa4 Bxc4 >Nxc4 fxe4 >11/01|000:05:26| 80654616| +181| bxc5 Rae8 Ne4 Nc8 Ng5 Bxc5 Bb2 Nd6 Qf3 f5 >Ne6 Rxe6 dxe6 fxe4 >12/01|000:13:16| 196539389| +184| bxc5 Rae8 Ne4 Nc8 Nd2 Qxc5 c4 Qd4 Rb1 f5 Qa4 >Bxc4 Qxc4 Qxc4 Nxc4 fxe4 >13/01|000:41:57| 617714405| +126| bxc5 Rae8 Ne4 Nc8 Ng5 Bxc5 Qf3 Qe5 Rb1 Qxg5 >Kd1 Qe7 Nxc5 Qxc5 Bxf4 >14/01|006:34:58| 3023144158| +114| bxc5 Rae8 Ne4 Nc8 Ng5 Bxc5 c3 Qe5 Kd2 Be3+ >Kc2 h6 Bxe3 fxe3 Nc5 Qxg5 Nxa6 Qxg2+ >15/01|021:38:18| 8888700927| +75| bxc5 Rae8 Ne4 Nf5 Ng5 Bxc5 c3 Qe5 Kd2 Be3+ >Kc2 h6 Bb2 hxg5 Nxg5 Nd4+ cxd4 Qxg5 >16/01|077:56:10| 45546679290| +57| bxc5 Rae8 Ne2 Qxc5 c4 Nxd5 Qd4 Qxd4 Nxd4 Nc3 >Bb3 Bb7 Bb2 Bxg2 Rg1 Nxe2 Nxe2 f3 >16/03|134:41:26| 76358818996| +60| Bb2 Nf5 Kd2 Ne3 bxc5 Nxd1 cxd6 Qxd6 Rhxd1 >Qc5 Kc1 Bc4 Bxc4 Qxc4 d6 Rae8 > >So, not until 16-ply does MacChess see bxc5 as less than optimum. Do you know if Valvo played more correspondence games against Deep Thought? I am very interested. José.
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