Author: Vincent Diepeveen
Date: 05:51:44 05/11/98
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On May 11, 1998 at 02:50:40, Howard Exner wrote: >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. The reason most programs don't consider this move has to do with the chessinsight of the programmer. Their kingsafety in endgames is usually either turned off completely, or turned off almost. I think this is the main reason why most programs have so much problems finding this move. Vincent
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