Author: Hans Havermann
Date: 17:40:24 04/28/99
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.
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