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Cray Blitz (Computer) vs Deep Thought (Computer)
ACM Albuquerque (1991), rd 4
Sicilian Defense: Classical Variation. General (B56)  ·  0-1


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sac: 59...h3 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Jan-24-09  rwbean: "Deep Thought II played its first public event at the 1991 ACM Computer Chess Championship, held in Albuquerque, New Mexico from November 17-20. Instead of using the Dlugy opening book, the "Karpov opening book" was used. Deep Thought II won all its games; however, in one of its Black games, we had a scare, as the Karpov book allowed our opponent the option of getting a repetition draw right at the opening -- Anatoly was well known to be willing to draw as Black. To me, the most impressive game played by Deep Thought II in this event was against Cray Blitz. For over ten moves (ten moves each by White and Black, or twenty plies total), Cray Blitz had no inkling that it was getting killed, while Deep Thought II was predicting the entire game continuation and assessing the game as completely won. Crazy Blitz was one of the fastest chess programs around, and to outsearch it by this weide margin exceeded by wildest expectation."

-- "Behind Deep Blue" pp134-135

"When Black (Deep Thought II) played 27. c5, they had failed high, with a score > 2.000 according to my notes. ... After making move 33. Rb1, Cray Blitz's score was still -.092, nearly zero. While pondering, it failed low, and saw itself losing a pawn, which was likely a horizon effect move to postpone the bishop problem a ways further... By move 43, we were down to -1.9." -- Robert Hyatt,, 1997-02-17

Rybka 3:

prefers 27. Bd4 (19 ply, eval 0.00, pv 27. Bd4 c5 28. Bxe5 dxe5 29. Be4 Raa7 30. Rd8)

agrees with 28. Be4 (17 ply, eval -0.31, pv 28. Be4 Ra6 29. Rd2)

prefers 29. Rd2 (21 ply, eval -0.35, pv 29. Rd2 Rd7 30. g3 c4 31. Bd4)

agrees with 29... f5 (21 ply, eval +0.78, pv 29... f5 30. Bc2 Rb7 31. Bd8 g6 32. Bg5)

agrees with 32... c4 (18 ply, eval +1.07, pv 32... c4 33. Rb1 Bd7 34. R2f1)

prefers 34 ... Rxa2 (19 ply, eval +1.94, pv 34... Rxa2 35. b4 Bh6 36. Re2 Bb5 37. Nd1 Bf4). DT2 wastes a move and allows White to play 35. Bg5 preventing ... Bh6.

All in all, I think DT2's evaluation was just too optimistic, and looking at these kinds of games with modern computers is like putting on a better pair of glasses, everything goes from blurry into sharp focus.

Premium Chessgames Member
  Marmot PFL: A victory for talent, technique and will to win in equal measure. There is much we humans can learn from these machines.
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