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Subject: Re: Effect of game history only

Author: Robert Hyatt

Date: 09:03:30 01/23/01

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On January 22, 2001 at 17:12:52, Jeff Lischer wrote:

>>
>>I'll try playing the moves through with the game history and see if the quirky
>>Rg8 rears its ugly head.
>
>Howard,
>
>I just discovered that you don't even need to play through the moves to see Rg8
>appear. Try the following:
>
>Save the game up to the move in question in a pgn file. Then select New Game
>(this clears the hash tables). Now open the game from the pgn file. Have Century
>analyze the position. Even without previous analysis and with completely cleared
>hash tables, Century will not find O-O and instead it plays Ne4, d6, and Rg8. I
>never knew that the game history could make a difference like that.

The main importance of the game history is potential repetitions.  If you set
up a raw position, with no history, then no repetitions are possible unless
they occur below the position you started with.  With a game history, some
moves might repeat positions from earlier in the game, and influence the score
in strong (or weak) ways...




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