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Subject: Re: Null move reductions

Author: Robert Hyatt

Date: 17:55:13 10/05/98

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On October 05, 1998 at 18:15:16, Will Singleton wrote:

>On October 05, 1998 at 17:09:57, Robert Hyatt wrote:
>>1.  positionally, because crafty knows that two connected passed pawns on the
>>6th rank, where there is little material left, and the king too far away, and
>>the pawns are not blockaded, etc, is won for the pawns.  So I solve this one
>>positionally with no depth:
>Right, looks right.  But if the pawns were on the 5th rank with a rook on the
>board, you couldn't assume they'd promote, right?

Right.  This is old chess "lore" that works perfectly.  If the two pawns can
reach the 6th, and neither can be captures immediately, the rook is helpless
and you win the rook for a pawn and make a new queen....  but on the 5th, the
rook has time to blockade one, and let the other advance far enough that it
can win it without allowing the other to promote..

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