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Subject: Re: Mate # > depth searched ??

Author: Robert Hyatt

Date: 19:37:19 07/13/01

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On July 13, 2001 at 21:26:27, John Wentworth wrote:

>I started having Fritz6 analyze a game and it's analysis was showing -#29 though
>the depth was only 14/36. How could the program see a mate 29 moves deep but
>only be searching 14 moves deep? I'am sure there is a logical reason for this
>but I don't know what it is.


Three possibilities:

1.  search extensions can extend the search along selected lines so that a
program can find deep mates.  mate in 29 moves is a bit much for this so I
doubt this is the case here.

2.  hash hits can graft parts of a tree together in strange ways, producing
mates far deeper than you might expect.  But I doubt this happened here
either.

3.  A tablebase hit deep in the search is the most likely explanation...



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