Author: Mike Byrne
Date: 09:36:58 05/31/04
Go up one level in this thread
On May 31, 2004 at 12:21:24, Robert Hyatt wrote:
>On May 31, 2004 at 07:20:39, Uri Blass wrote:
>
>>On May 30, 2004 at 23:48:26, Mike Byrne wrote:
>>
>>>This is semi-follow up to Jorge post regardng Game 6 of the first match between
>>>Kasparov and Deep Blue , but not directly so I started a new thread.
>>>
>>>I witness this game live in Philadelphia with my brother-in-law. If anybody is
>>>interested in a program from the match . e-mail me privately. There was
>>>laughter after Nh5, it certainly did look like a computer move at the time..
>>>
>>>Annotations Copyright by Chessbase
>>>
>>>[Event "Philadelphia m"]
>>>[Site "Philadelphia"]
>>>[Date "1996.02.17"]
>>>[Round "6"]
>>>[White "Kasparov, Garry"]
>>>[Black "Comp Deep Blue"]
>>>[Result "1-0"]
>>>[ECO "D30"]
>>>[WhiteElo "2795"]
>>>[Annotator "Friedel"]
>>>[PlyCount "85"]
>>>[EventDate "1996.02.??"]
>>>[Source "ChessBase"]
>>>
>>>1. Nf3 {Keene Borik} d5 2. d4 c6 3. c4 e6 4. Nbd2 Nf6 5. e3 c5 {a tempo-losing
>>>move to deviate from game four. The Deep Blue team has prepared a line that
>>>should open up the position.} 6. b3 Nc6 7. Bb2 cxd4 8. exd4 Be7 9. Rc1 O-O 10.
>>>Bd3 Bd7 11. O-O Nh5 $2 {
>>>A very strange move which absolutely nobody at the site liked.} 12. Re1 Nf4 13.
>>>Bb1 Bd6 14. g3 Ng6 15. Ne5 Rc8 16. Nxd7 Qxd7 17. Nf3 Bb4 18. Re3 Rfd8 19. h4
>>>Nge7 20. a3 Ba5 21. b4 Bc7 22. c5 {Four consecutive pawn advances which drive
>>>back all the black pieces, which are stumbling over each other on the
>>>queenside.} Re8 23. Qd3 g6 24. Re2 Nf5 25. Bc3 h5 26. b5 {Keene calls this
>>>"Kasparov's strategy of strangulation" and points out that 26.b5 doesn't just
>>>attack the knight but establishes "a giant, crawling mass of white pawns,
>>>rather resembling a colossal army of soldier ants on the move."} Nce7 27. Bd2
>>>Kg7 28. a4 Ra8 29. a5 a6 30. b6 Bb8 {# Kasparov has shut the black bishop and
>>>rook out of play to the end of the game. Black's position is lost.} 31. Bc2 Nc6
>>>32. Ba4 Re7 33. Bc3 Ne5 {actually accelerating the end.} 34. dxe5 Qxa4 35. Nd4
>>>Nxd4 36. Qxd4 Qd7 {IM Otto Borik that other variations also lose:} (36... Qxd4
>>>37. Bxd4 {and Rb2, c6 wins, e.g.} Re8 38. Rb2 Rc8 39. c6 Rxc6 40. Rxc6 bxc6 41.
>>>b7 Ra7 42. Bxa7 Bxa7 43. b8=Q Bxb8 44. Rxb8) (36... Qc6 37. Bd2 Rd7 38. Bg5 Kf8
>>>39. Bf6 {and now f3, Rg2 and g4 wins.}) 37. Bd2 Re8 38. Bg5 Rc8 39. Bf6+ Kh7
>>>40. c6 $1 bxc6 (40... Rxc6 41. Rec2 Rxc2 42. Rxc2 Qe8 43. Qc5 {wins}) 41. Qc5
>>>Kh6 42. Rb2 Qb7 43. Rb4 $1 {And the Deep Blue team reseigned for the machine.
>>>Why did Black resign? IM Malcolm Pein explained this on the Internet: "Black
>>>has four pieces left plus his king. The rook on a8 and the bishop on b8 cannot
>>>move. If the queen on b7 moves it allows b7, winning a rook. If the rook on
>>>c8 moves White can play Qxc6, forcing an exchange of queens. After that there
>>>are many ways to win, the most prosaic being double on the c file and play Rc8.
>>>So we are left with Kh7! The simplest way then is Qe7 Qxe7 Bxe7 threatening b7
>>>and if Rc8-e8 then b7 Ra7 Bc5 etc. Note that had Kasparov left his rook on b2
>>>Black would have ...Bxe5 gaining a tempo."} (43. Rb4 Qd7 (43... Re8 44. Qxc6
>>>Qxc6 45. Rxc6 Kh7 46. b7 Ra7 47. Rbb6 Rg8 48. Rc8 d4 49. Rbc6 g5 (49... d3 50.
>>>Rxg8 Kxg8 51. Rc8+ Kh7 52. Rh8#) 50. Rxg8 Kxg8 51. Rc8+ Kh7 52. Rh8+ Kg6 53.
>>>Rg8+ Kf5 54. f3 {Threat: Rxg5#} Bxe5 55. Bxe5 {Threat: ditto} Kxe5 56. b8=Q+ {
>>>and mate.}) (43... Kh7 44. Qe7 Qxe7 45. Bxe7 Re8 46. b7 Ra7 47. Bc5 Rd8 48.
>>>Bxa7 Bxa7 49. Rxc6 Bb8 50. Rc8 {winning}) 44. b7) 1-0
>>>
>>>[d]2rr2k1/pp1qnppp/2n1p3/3p4/1bPP3P/1P2RNP1/PB3P2/1BRQ2K1 w - - 0 20
>>>
>>>There was much disussion in the audience about 20.Bxh7! - Yasser indicating
>>>that against a human , Kasparov most definitely would have played that move.
>>>After the game, Kasparov indicated as such - but he did not play it because he
>>>saw no reason to take the chance against Deep Blue. He was confident that he
>>>had a "won" game at this point and the was no reason to take unnecceary risks.
>>>Hsu also confirmed later that Deep Blue also like Bxh7 as the best move and it
>>>saw white with a winning score.
>>
>>
>>I remember that I read that it saw only a draw score for that move.
>>I never read that it saw winning score for Bxh7.
>>
>>Where did you read about the claim that deep blue saw Bxh7 with a winning score.
>>
>>Uri
>
>I talked to Hsu right after the match ended. His comment to me then was "DB saw
>Bxh7+ led to a repetition. But after a3, and making the bishop move, Bxh7+
>became a real threat to win."
>
>That's all I really remember, but he definitely said DB was expecting Bxh7 and
>was showing a draw score at that point....
My recollection is fuzzy as to when (20.Bxh7+ or 21 Bxh7+) he said Bxh7 was real
strong at the site - but I can accept that he might have said or meant after 20.
a3 - bishop move and then 21. Bxh7+!
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