Author: Ed Schröder
Date: 04:43:02 05/24/99
REBEL vs GM Rohde (move 23 and 26) 23. exd4 or Rxb4 It has been said that 23.Rxb4 is a better move than 23.exd4 (Rebel's move). I partly agree but IMO white's position is already lost also after 23.Rxb4. The fact that computers evaluate the position after Rxb4 with +0.50 or higher is no promotion for the current state of art of computer chess IMO. I had a close look at Rebel's moves 23 and 26. In Rebel7 I removed a "mate- threat" extension which impact I considered none to zero. However this game seems to be full of it. When I enable Rebel6's extension again (just one instruction) Rebel sees all the danger much quicker. REBEL 10.5 (as played in the game) 1r1qr2k/1p4pp/3p4/1R1B1p2/1pPp4/4P1Pb/1P3P1P/Q3R1K1 w - - 00:00:04 7.00 0.99 e3xd4 Re8xe1+ Qa1xe1 Qd8-e8 Qe1-d2 f5-f4 Bd5xb7 (2) 00:00:10 8.00 1.05 e3xd4 Re8xe1+ Qa1xe1 Qd8-e8 Qe1xe8+ Rb8xe8 f2-f4 (5) 00:00:44 9.00 1.10 e3xd4 h7-h6 Rb5xb7 Rb8xb7 Bd5xb7 Kh8-h7 Bb7-d5 (11) 00:01:09 10.00 0.83 e3xd4 Rb8-a8 Re1xe8+ Qd8xe8 Qa1-c1 Qe8-e2 Rb5xb7 (47) 00:02:16 11.00 0.83 e3xd4 Rb8-a8 Re1xe8+ Qd8xe8 Qa1-c1 Qe8-e2 Rb5xb7 (81) 00:05:10 12.00 0.60 e3xd4 Rb8-a8 Re1xe8+ Qd8xe8 Qa1-c1 Qe8-e2 Rb5xb7 (219) REBEL 10.5 (with the Rebel6 extension) 1r1qr2k/1p4pp/3p4/1R1B1p2/1pPp4/4P1Pb/1P3P1P/Q3R1K1 w - - 00:00:05 7.00 1.01 e3xd4 Re8xe1+ Qa1xe1 Qd8-e8 Qe1-d1 f5-f4 Kg1-h1 (2) 00:00:11 8.00 1.05 e3xd4 Re8xe1+ Qa1xe1 Qd8-e8 Qe1xe8+ Rb8xe8 f2-f4 (6) 00:00:27 9.00 1.02 e3xd4 Rb8-a8 Re1xe8+ Qd8xe8 Qa1-c1 Ra8-a7 Rb5-b6 (12) 00:00:46 10.00 0.83 e3xd4 Rb8-a8 Re1xe8+ Qd8xe8 Qa1-c1 Qe8-e2 Rb5xb7 (30) 00:01:25 11.00 0.00 e3xd4 Rb8-a8 Re1xe8+ Qd8xe8 Qa1-c1 Qe8-e2 Rb5xb7 (69) 00:09:58 11.02 0.50 Rb5xb4 d4xe3 Re1xe3 Re8xe3 f2xe3 h7-h6 Bd5xb7 (120) Not that it matters much as black gets the crucial e-file anyway. Rebel10.5 needs 15 plies (and 3 hours) to see that 23.exd4 is 0.00, the new version 11 plies (and 1 minute). I think I will keep the change :-) 26.f4? (Bg2) REBEL10.5 (with the Rebel6 extension) r6k/1p4pp/3p4/1R1B1p2/1pPP4/6Pb/1P2qP1P/2Q3K1 w - - 00:00:04 7.00 0.47 Rb5xb7 Ra8-e8 f2-f4 Qe2-d3 Rb7xb4 Qd3xd4+ Kg1-h1 (3) 00:00:06 8.00 0.00 Rb5xb7 Ra8-e8 f2-f4 g7-g6 g3-g4 Re8-e4 Rb7-b8+ (4) 00:00:13 9.00 0.00 Rb5xb7 Ra8-e8 f2-f4 h7-h6 Rb7-f7 Re8-e4 Rf7-f8+ (10) 00:00:30 10.00 -0.04 Rb5xb7 Ra8-e8 f2-f4 h7-h6 Rb7-f7 Qe2-d3 Kg1-h1 (19) 00:01:33 11.00 -1.88 Rb5xb7 Ra8-e8 f2-f4 g7-g6 Bd5-h1 Qe2-e1+ Qc1xe1 (47) 00:03:36 11.08 -0.19 Bd5-g2 Qe2-d2 Qc1-f1 Bh3xg2 Kg1xg2 Qd2xb2 Rb5xb7 (175) 00:04:32 12.00 -0.19 Bd5-g2 Qe2-d2 Qc1-f1 Bh3xg2 Kg1xg2 Qd2xb2 Rb5xb7 (234) Also here the Rebel6 "mate-threat" extension does miracles and the correct move is played. I will have a closer look if this old Rebel6 "mate-threat" extension can be improved. Ed Schroder -------------------------------------------------------------------------- [Event "Monthly GM Challenge"] [Site "Internet (Rebel Home Page)"] [Date "1999.05.22"] [Round "?"] [White "Rebel 10.5"] [Black "GM M. Rohde"] [Result "0-1"] [WhiteElo "?"] [BlackElo "?"] [ECO "E00"] 1. d4 Nf6 2. c4 e6 3. g3 Bb4+ 4. Bd2 c5 5. Bxb4 cxb4 6. Bg2 O-O 7. Nf3 d6 8. O-O a5 9. a3 Na6 10. Nbd2 Re8 11. Ne1 e5 12. Nc2 bxa3 13. Rxa3 Rb8 14. Ne4 Nxe4 15. Bxe4 Bh3 16. Re1 Qb6 17. e3 f5 18. Bd5+ Kh8 19. Qa1 Nb4 20. Nxb4 axb4 21. Ra5 exd4 22. Rb5 Qd8 23. exd4 Ra8 24. Rxe8+ Qxe8 25. Qc1 Qe2 26. f4 Qd3 27. Rxb7 Re8 28. Kh1 Qc2 29. Qe3 Qb1+ 30. Qg1 Qxb2 31. Rb6 h6 32. Ra6 Qc2 33. c5 dxc5 34. dxc5 Qc3 35. Ra1 b3 36. Rc1 Qd3 37. Rd1 Qe2 38. Rb1 b2 39. Qd1 Qxd1+ 40. Rxd1 Rd8 41. Rb1 0-1
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