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Subject: Re: Test position from a Frascati

Author: John Merlino

Date: 12:22:45 06/08/05

Go up one level in this thread


On June 08, 2005 at 04:18:46, ludicrous wrote:

>[Event "GM"]
>[Site "Frascati ITA"]
>[Date "2005.05.24"]
>[Round "4"]
>[White "Khenkin, I."]
>[Black "Rombaldoni, D."]
>[Result "0-1"]
>[ECO "E12"]
>[WhiteElo "2610"]
>[BlackElo "2336"]
>[PlyCount "146"]
>[EventDate "2005.05.21"]
>
>1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. a3 d5 6. cxd5 Nxd5 7. e3 Be7 8. Bb5+
>c6 9. Bd3 O-O 10. Qc2 h6 11. O-O c5 12. e4 Nxc3 13. bxc3 Qc8 14. Qe2 Ba6 15.
>Rd1 Bxd3 16. Rxd3 Nd7 17. Bf4 cxd4 18. cxd4 Qa6 19. Rad1 Rfd8
>
>[D]r2r2k1/p2nbpp1/qp2p2p/8/3PPB2/P2R1N2/4QPPP/3R2K1 w - - 0 20
>
>Khenkin played Bxh6!?
>
>Junior 7 likes the move.  What other programs choose to play this sac?  Junior 9
>doesn't seem to favor the sac.
>
>
>20. Bxh6 gxh6 21.
>Ne5 Qa4 22. Rg3+ Kf8 23. Nxf7 Nf6 24. Nxd8 Rxd8 25. e5 Nd5 26. Qh5 Nf4 27.
>Qxh6+ Ke8 28. Rg8+ Kd7 29. Rxd8+ Kxd8 30. Re1 Qxd4 31. Qh8+ Kd7 32. Qh7 Qd2 33.
>Qb1 Ne2+ 34. Kf1 Nc3 35. Qh7 a5 36. g3 Qd5 37. f4 Qf3+ 38. Kg1 Ne2+ 39. Rxe2
>Qxe2 40. h4 b5 41. h5 b4 42. axb4 axb4 43. h6 b3 44. f5 Qd1+ 45. Kg2 Qc2+ 46.
>Kh3 Qxf5+ 47. Qxf5 exf5 48. h7 b2 49. h8=Q b1=Q 50. e6+ Kxe6 51. Qg8+ Kd6 52.
>Kh2 Qc2+ 53. Kh3 Qe4 54. Kh2 Qe2+ 55. Kh3 Qh5+ 56. Kg2 Qg5 57. Qc8 Bd8 58. Qa6+
>Ke7 59. Qa3+ Kf7 60. Qd6 Be7 61. Qd5+ Kg7 62. Qd7 Qf6 63. Kh3 Qe5 64. Kh2 Kh6
>65. Qd2+ Kg6 66. Qa2 Bd6 67. Qg8+ Kh6 68. Kh3 Qg7 69. Qe6+ Qg6 70. Qe3+ Kh7 71.
>Qd3 Qg4+ 72. Kh2 Qh4+ 73. Kg2 Qe4+ 0-1

CM9_R1 on an AMD 2500 prefers Ne5:

Time	Depth	Score	Positions	Moves
0:00	1/6	0.39	48901		20.d5 Nc5 21.Re3 Qxe2 22.Rxe2 Bd6
					23.Bxd6 Rxd6
0:00	1/6	0.43	60219		20.Qc2 Nf6 21.d5 Rac8 22.Qb3 Qc4
0:02	1/7	-0.01	181723		20.Qc2 Rac8 21.Bc7 Bxa3 22.Ra1
					Qb7 23.Rc3 Bb4
0:02	1/7	0.55	214975		20.d5 Nc5 21.Re3 Qa4 22.Rd4 Qa5
					23.Rb4 Bf6
0:03	1/8	0.39	360077		20.d5 Nc5 21.Re3 Qxe2 22.Rxe2 f6
					23.Nd4 Rac8 24.Nb5 Rd7
0:04	1/8	0.43	573324		20.Ne5 Rac8 21.Nxd7 Rxd7 22.Qg4
					Bxa3 23.Rg3 Bf8 24.Bxh6 g6 25.Qh5
0:06	1/8	0.55	991032		20.Ne1 Qa4 21.Rg3 Nf8 22.Nc2 Rac8
					23.Nb4 Bxb4 24.axb4
0:09	1/9	0.25	1760814		20.Ne1 Qa4 21.Rg3 Nf8 22.Qc2 Qxc2
					23.Nxc2 Rac8 24.Bxh6 Rxc2 25.Rxg7+
					Kh8 26.Rxf7 Bxa3 27.Rxa7
0:15	1/9	0.50	3100507		20.Ne5 Qa4 21.Rg3 Rac8 22.Nxd7
					Rxd7 23.Bxh6 Bf6 24.d5 Rc2
0:23	1/10	0.40	5078416		20.Ne5 Nxe5 21.Bxe5 f6 22.Qg4 fxe5
					23.Qxe6+ Kf8 24.Qxe5 Bf6 25.Qe6
					Rac8
1:03	1/11	0.58	15166325	20.Ne5 Nxe5 21.Bxe5 f6 22.Qg4 fxe5
					23.Qxe6+ Kf8 24.Rf3+ Bf6 25.Rxf6+
					gxf6 26.Qxf6+ Kg8 27.Qg6+ Kf8 28.Qxh6+
					Kf7 29.Qh7+ Ke6
2:10	1/12	0.60	32326429	20.Ne5 Nxe5 21.Bxe5 f6 22.Qg4 fxe5
					23.Qxe6+ Kf8 24.Rf3+ Bf6 25.Rxf6+
					gxf6 26.Qxf6+ Kg8 27.Qg6+ Kf8 28.Qxh6+
					Kg8 29.Qg6+ Kh8 30.Qf6+ Kh7
4:06	1/13	0.42	63277888	20.Ne5 Nxe5 21.Bxe5 f6 22.Qg4 fxe5
					23.Qxe6+ Kf8 24.Rf3+ Bf6 25.Rxf6+
					gxf6 26.Qxf6+ Kg8 27.Qg6+ Kf8 28.Qxh6+
					Kf7 29.Qh7+ Kf8 30.Qh8+ Kf7 31.Qh5+
					Kf8

After forcing the first several moves after the sac (20.Bxh6 gxh6 21.Ne5 Qa4
22.Rg3+), The King prefers 22...Kh7 with a score of -0.79.

jm



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