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Subject: Re: A new kind of "swindle mode" for Crafty

Author: Uri Blass

Date: 07:02:05 09/28/00

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On September 28, 2000 at 09:52:43, Vincent Lejeune wrote:

>On September 28, 2000 at 09:44:41, Uri Blass wrote:
>
>>On September 28, 2000 at 07:15:45, Vincent Lejeune wrote:
>>
>>>I would suggest a new type of "swindle mode" : the method is based on 1) make
>>>the right move difficult to find for a human and 2) play quickly to put pressure
>>>on human
>>>
>>>Here's the Idea : if an endgame is a tablebase draw, select all the drawing
>>>moves and explore them only in tablebase to measure where the human will have
>>>the hardest work to do : calculate, for all this drawing moves, with iterative
>>>deepening, the worst ratio (number of drawing moves for human divide by number
>>>of possible moves for human) for the human in the tree, because a narrower path
>>>is difficult to follow (see the game Deep Thought-Alex Fishbein post some days
>>>ago: where human had only one drawing move he didn't find it). The depth still
>>>to be dertimined may be 5 plies, may be 10 or simply play right after the
>>>human's move to put maximum pressure.
>>>
>>>This method exploit the main point of tablebase eg : the precision allied with
>>>the speed; where the human brain get kill by machine.
>>>
>>>I hope that Bob will test this algorithm for Crafty , I'm confident in it :)
>>>
>>>If I was not enough clear please tell me...
>>>
>>>Best regards
>>>Vincent Lejeune
>>
>>I do not understand
>>
>>Here is a possible position KRB vs KR.
>>[D]8/7R/2k2K2/5B2/8/8/8/2r5 w - - 0 1
>>
>>After Rc7+ black has exactly one drawing move out of 5.
>>
>>Do you suggest Crafty to play Rc7+ because the ratio is probably the best with
>>this move or do you suggest to search deeper in order to calculate the best
>>ratio that you can force in 5 plies assuming the opponent play good moves?
>>
>>Uri
>
>You overlooked one point : "select all the drawing moves and explore them"

The way to explore them should be defined.

Do you suggest to analyze them to a small depth in order to see that they do not
lose material and that the opponent cannot force a drawn KB vs K?

Uri



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