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Subject: Re: Deep Blue and the

Author: Ed Schröder

Date: 10:08:17 11/16/98

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>>Thanks for posting the main variation. I clearly remember the end position
>>again. Based on this impressive main variation I can come to no other
>>conclusion other then that Deep Blue must have a speculative king safety.

>I'm not ruling this out as an hypothesis, but please tell me: How does a
>speculative king safety agree with moves such as g5 in the 1st game, b4 in the
>4th game, and a generally solid style throughout the match ?

Every engine has different styles. After game-1 which was more or less
lost on king safety (note 13..g5?! 28..f5?! and 30.f4!) they (perhaps)
decided to set the machine to aggressive to avoid positions as in game-1
which explains game-2 and the sacrificing 36.Qb6 <>39..Qe5 main
variation.


>>The other explanation, a bug, sounds not fair to the Deep Blue team.

>Actually bugs, or general malfunction during this part of the game, is quite
>high in my list of possible explanations. There are a lot of strange things
>going on. Here's one of them (the PV for iteration 10):

>36. Qb6 Rab8 37. axb5 Rab8 38. Qxa6 e4 39. Bxe4 Qe5 40. Bf3 Rd8
>41. Qa7 Qxc3 42. Bh5

>Question: how to explain the appearance of the move 41.Qa7 in the PV ?

41.Qa7 is a plausible move for a speculative engine. It prevents Qe3+

- Ed -



>Amir



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