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Subject: Re: Human rating differential compared to Computer vs. computer

Author: James B. Shearer

Date: 21:53:00 02/01/99

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On February 01, 1999 at 01:37:46, KarinsDad wrote:

>On January 31, 1999 at 16:54:47, James B. Shearer wrote:

                          <snip>

>>       Except in this case the "entire game" contained just 4 nonbook moves the
>>last 2 of which were pretty easy.
>
>Yes, and who was Kasparov's opponent? What was his rating? BTW, just because 24
>moves are in the book does not mean that both opponents knew the book to that
>level.

       Kasparov's opponent was Ivan Sokolov (FIDE 2610).  It doesn't really
matter whether the players knew they were in book, Kasparov played a (stated to
be inferior in MCO 10) book line for 23 moves and then blundered on moves 24 and
25 after which he was dead lost.  So to beat Kasparov on this day you just had
to know 24 book moves (within the capacity of an 1800 player) and then find two
good moves (also within the capacity of a 1800 player on a good day).  It
appears Kasparov was overconfident and did not start thinking until after he was
lost.  If Kasparov gets careless against 2600 GMs one can just imagine what
lemons he would occasionally produce against 1800 players.

                           <snip>
>
>The point that I'm trying to make is that GMs have very few weaknesses. It takes
>other GMs to spot them (and no, using your computer doesn't count since you
>would never have found the weakness without it being pointed out to you). They
>have studied for years and understand a position to a much greater degree than
>even regular masters, let alone Class A players. A superGM to a class A player
>is like a class A player to someone who just learned how to move the pieces.
>Even if a class A player did study a given superGM's games and prepared for him
>and found a trap, the superGM would most likely take losing a minor piece in
>stride and still whup up on the class A player. Odds of 1 in 317 are just
>blatantly incorrect for a 1000 point rating difference. Maybe odds of 1 in
>31,700 would be more accurate, it would be hard to say without the data.

      GMs make gross blunders occasionally and it does not take a GM to spot a
hung piece or simple mating combination.  Also it's kind of difficult to take
getting mated in stride (which was what was about to happen to Kasparov).
                            James B. Shearer



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