Author: Howard Exner
Date: 23:50:40 05/10/98
Go up one level in this thread
On May 10, 1998 at 18:51:35, Vincent Diepeveen wrote:
>GAME III:
>40,Bc7! Not very weird. A stupid program positionally, but tactical
>strong.
> This move is horrible, but tactically forced. DB has
>singular extensions
> and stuff, so sees that this move is forced.
Here is a post of mine last year on RGCC which relates to the Bc7 move.
It received no replys (probably because of where I posted it - RGCC- and
maybe due to the header, "Game # 3 GK vs DB". Should have called it
"facist move made" to get some attention) Anyway, I'll post it again
because
my guess is the same as Vincent's, that this is a tactical necessity.
1r1b4/r4p1k/5Pbp/pBpNp3/2P1P1K1/3P4/R7/5R2 b - - id=Kasparov,G - DEEP
BLUE;
bm=d8c7;Here is a position from the 3rd match game of Garry Kasparov vs
Deeper
Blue. Deep Blue makes a move B-c7 which offers to exchange a bad
bishop and pawn for Garry's good Knight on d5. Garry made the exchange
and the game eventually ended in a draw. Out of curiousity I wondered
what
may have happened if B-c7 was not played. Did Deep Blue see that without
B-c7 its position may be losing?
As Rebel 8 as a sparring partner (Time Control 40/2 on a K6-200) I took
white and played the following:40. ... Ra7-b7
41. Rf1-h1 Rb7-a7 (examined h5+ as well but white eventually
followed
the same theme of the exchange sac)
42. Rh1xh6+ Kh7xh6 43. Ra2-h2+ Bg6-h5+ 44. Rh2xh5+ Kh6-g6
45. Rh5-g5+ Kg6-h7 46. Rg5xe5 a5-a4 47. Re5-h5+ Kh7-g8
48. Rh5-h2 a4-a3
49. Rh2-a2 Rb8-a8 (here white can draw at will. Rebel 8 evals this
as=)
50. Kg4-f5 Kg8-f8 51. e4-e5 Ra8-b8
52. Nd5-e3 Rb8-b6 (now Rebel 8 sees itself as losing) 53. Ne3-g4
Ra7-a6
54. Ra2-h2 Kf8-g8 55. Ng4-h6+ Kg8-f8 56. Bb5xa6 Rb6xa6
57. Rh2-a2 Kf8-e8 58. Kf5-e4 Bd8-c7
59. Ke4-d5 Bc7-b8 (and here white will win easily)
Of course all of this is just one line of many possibilities. The point
is
I applaud the move B-c7 which I doubt any other computer program
would ever consider. This position I feel is dificult for computers
because
it illustrates the relative value of pieces based on position. Is there
another
defense for black ? All his pieces and King are bound and gagged.
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