2

The game is justifiably famous and is linked here.

[FEN ""]
[startply "39"]

1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7 5.Ng5 Ngf6 6.Bd3 e6 7.N1f3 h6 8.Nxe6 Qe7 9.O-O fxe6 10.Bg6+ Kd8 11.Bf4 b5 12.a4 Bb7 13.Re1 Nd5 14.Bg3 Kc8 15.axb5 cxb5 16.Qd3 Bc6 17.Bf5 exf5 18.Rxe7 Bxe7 19.c4 1-0 

It was a shocking upset at the time because 19. c4 looks completely harmless in this position.

Analyses after the match and around the time predicted the position would be roughly even for several iterations; Kasparov could have held out. Kasparov had battled Deep Blue at least eleven times prior to this match (six times in 1996 and five uptil then in 1997) and had managed to win convincingly against it, albeit with some losses - but this had not deterred him before.

Which is why it is all the more surprising Kasparov gave up at this exact point in the game.

What was going on in Kasparov's head that made him decide he could not possibly continue after c4? Was it simply the idea that Deep Blue must be cheating? Was it some set of lines that made him quail? Were other events around the day eating at him?

I'm completely mystified by this decision, and would love to have some answers!

6
  • Kasparov has admitted that he was perfectly aware that the line he played was bad if white plays the sacrifice, but he didn't think the computer would realize that the sacrifice on e6 is a strong move. So he was completely rattled when the computer surprised him by playing the strongest move in the position. After c4, the queenside opens, and even if there's no immediate checkmate, it's clear that black's king is doomed. There's no real point in continuing this when the opponent is strong enough. – Scounged May 13 at 19:14
  • @Scounged do you have a source for Kasparov has admitted that he was perfectly aware that the line he played was bad if white plays the sacrifice, but he didn't think the computer would realize that the sacrifice on e6 is a strong move? I'm under the impression he accidentally entered that line. – Allure May 13 at 21:17
  • @Allure Apparently, he mentions it in his book "Deep Thinking", but I don't think this is where I heard of this initially. If you look through the discussion in the game link provided in this question you will find some more detail; apparently Garry was unaware that the Deep Blue team had included that particular opening line into Deep Blue's opening book, and thought it was sure to work out. And then when Nxe6 came on the board he just started shaking his head in disbelief. Although, this could just be something that Garry is saying because he wants to "save face" for some reason. – Scounged May 14 at 2:02
  • Stockfish/Lichess +3 to 4. I tested a few defenses, but Blacks forces are scattered and everything unravels. (Amusingly, Nxe6 is only +0.2, but has 72% White wins...The advantage value goes up rapid during the game, though. Kc8 seems to be the worst idea.) – Hauke Reddmann May 14 at 13:15
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    @Akavall Yeah, I think the Deep Blue team claimed that it found it on its own, but that this claim has been disputed. The details surrounding that match are not entirely clear to me, I'm not sure I trust either Garry or IBM to give a completely fair account of what was going on. – Scounged May 14 at 16:01

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