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Subject: Re: I understand but...

Author: blass uri

Date: 13:18:48 10/04/98

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On October 04, 1998 at 13:58:04, blass uri wrote:

>
>On October 04, 1998 at 13:37:09, blass uri wrote:
>
>>

>>>I assume you mean "seven bits".  But this doesn't tell me anything about how
>>>to choose between two moves in the tree, when one is mate in 10 and one is
>>>mate in 30.  And if I keep choosing mate in 30, I encounter problems, because
>>>I can end up drawing by the 50 move rule, since the "distance to conversion"
>>>doesn't factor in the moves played *before* this position was reached, only
>>>what happens *after* this position was reached...
>>>
>>>In any case, distance to mate is trivial to use, and never screws up.
>>
>>theoretically distance to mate may cause problems becuase if one is mate in 70
>>that is practically a draw because of the 50 move rule and the second is mate in
>>80 that is not a draw because there is a capture after 40 moves than mate in 80
>>is the right move.
>
>I understand that the tablebases in the first case  may say draw and solve this
>problem

it does not solve the problem because you may have mate in 70 that is
practically not a draw by tablebases because you do only 49 moves before the
first capture but is a draw in practical game because you did 2 moves without
capture or moving a pawn before the position.

For this reason it is better that the tablebases will not say mate in N but say
capture or moving a pawn to a winning position in N

Uri




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