Author: James T. Walker
Date: 09:56:48 12/12/98
Go up one level in this thread
On December 11, 1998 at 11:48:36, Laurence Chen wrote:
>On December 10, 1998 at 16:34:20, Georg Langrath wrote:
>
>>In the begining chesscomputers never made real sacrifices for position. Super
>>Constellation was the first chesscomputer that was able to do that.
>>
>>Dear members of CCC. Have you nice examples of genuine sacrifices from your
>>chesscomputers? They are nice to look at, and it is interesting to examine if
>>other programs make the sacrifice. Of course all sacrifices are not healthy, but
>>they are always nice to look at, especially from chesscomputers.
>>
>>Please answer this notice with sacrifices from your computers. I think we all
>>like to examine them.
>>
>>Georg
>Junior 5.0 sacrifices a Knight on move 20 for the initiative and attack.
>
>[Event "Level=Blitz:30'+5"]
>[Site "?"]
>[Date "1998.12.11"]
>[Round "?"]
>[White "CM 6000, 16MB."]
>[Black "Junior 5.0, 8MB."]
>[Result "0-1"]
>[ECO "B89"]
>[PlyCount "116"]
>[EventDate "1998.12.11"]
>
>1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bc4 e6 7. Be3 a6 8. Qe2
>Qc7 9. O-O-O Be7 10. Bb3 O-O 11. Nxc6 {0} 11... Qxc6 {0.03/13 88} 12. f3 {48}
>12... b5 {0.06/15 96} 13. Qf2 {39} 13... a5 {-0.28/14 48} 14. a3 {15} 14... b4
>{-0.61/14 99} 15. Ba4 {8} 15... Qb7 {-0.74/13 78} 16. Nb1 {11} 16... d5 {
>-0.74/13 68} 17. e5 {49} 17... bxa3 {-1.06/13 145} 18. Nxa3 {6} 18... Rb8 {
>-1.05/11 39} 19. Nb5 {62} 19... Bd7 {-1.22/12 0} 20. exf6 {41} 20... Bxf6 {
>-1.65/12 0} 21. c4 {22} 21... Rfc8 {-2.40/12 60} 22. Bc5 {8} 22... Bxb5 {
>-2.70/12 23} 23. Bxb5 {105} 23... dxc4 {-3.24/14 0} 24. Bd6 {39} 24... Qxb5 {
>-3.73/13 40} 25. Bxb8 {6} 25... Rxb8 {-3.73/10 10} 26. Qc2 {81} 26... Bxb2+ {
>-3.69/12 0} 27. Kd2 {27} 27... Qe5 {-3.72/11 15} 28. Qxc4 {48} 28... Ba3 {
>-3.64/12 0} 29. Rb1 {31} 29... Qg5+ {-3.69/11 0} 30. Ke2 {19} 30... Qxg2+ {
>-3.59/11 18} 31. Ke3 {28} 31... Bb4 {-3.61/11 0} 32. Rhd1 {34} 32... Qxh2 {
>-3.74/11 52} 33. Qd4 {7} 33... h5 {-3.48/10 59} 34. Rh1 {42} 34... Qc2 {
>-3.59/11 0} 35. Rbc1 {20} 35... Qf5 {-3.65/10 20} 36. f4 {36} 36... Ba3 {
>-4.95/11 116} 37. Rc3 {35} 37... Qg6 {-4.80/11 0} 38. Rf1 {127} 38... Qg3+ {
>-6.85/10 31} 39. Ke2 {9} 39... Qg2+ {-6.85/9 7} 40. Qf2 {8} 40... Rb2+ {
>-8.30/10 8} 41. Ke3 {11} 41... Rxf2 {-8.70/11 0} 42. Rc8+ {42} 42... Kh7 {
>-9.33/13 35} 43. Rxf2 {2} 43... Qg3+ {-9.31/11 66} 44. Ke2 {9} 44... e5 {
>-9.78/11 156} 45. Rc2 {6} 45... exf4 {-9.75/8 3} 46. Rf3 {32} 46... Qg2+ {
>-11.70/11 48} 47. Rf2 {5} 47... Qe4+ {-11.70/9 12} 48. Kf1 {4} 48... f3 {
>-11.31/9 8} 49. Rfd2 {18} 49... Qe3 {-13.92/11 23} 50. Rh2 {8} 50... Qd3+ {
>-18.38/9 10} 51. Ke1 {7} 51... Bb4+ {-18.72/9 14} 52. Kf2 {6} 52... Qxc2+ {
>-19.63/8 5} 53. Kxf3 {2} 53... Qxh2 {-20.35/8 10} 54. Ke3 {1} 54... Qd2+ {
>-#6/8 26} 55. Kf3 {5} 55... Qd3+ {-#4/8 7} 56. Kf2 {5} 56... Bc5+ {-#3/8 4} 57.
>Ke1 {5} 57... Qc2 {-#2/6 0} 58. Kf1 {4} 58... Qf2# {-#1/3 0} 0-1
>>>>>>>>>>>>>>>>>>>>>>>>
Hello Laurence,
The "sacrifice" you mention on move 20 is a very nice move. Actually the
sacrifice is by move 19..... Bd7 which allows the pawn to capture the knight.
However, I'm not sure you can call this a "Sacrifice" since most computer
programs will make the Bd7 move and allow the capture of the Knight. The
problem is the Knight on b5 is attacked 3 times and defended once so it is still
in danger plus the recapture of the pawn on f6 puts another attacker on the b2
square. Mate seems to be threatened if white attempts to save the Knight. This
is only my opinion as an amateur so I may be wrong. In any case it brings up
the question of what constitutes a "sacrifice" by a program. Since the score
went up by making the moves the computer thinks it is a good move which will
eventually lead to gain of material back with additional positional advantage in
the bargain. I would be interested in what programers say they consider a
sacrifice by their programs "If they do sacrifice" at all.
By the way the programs I tested your postion on were:
Program Time
Fritz5.16 0:01
Rebel 10 0:06
Rebel Dec. 0:18
Crafty15.20 3:05
CM5500 0:50
CM6000 1:06
In any case it was a good move and a nice game to view.
Regards,
Jim Walker
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