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[gnugo-devel] fast liberties & patterns anchored in goal

From: Trevor Morris
Subject: [gnugo-devel] fast liberties & patterns anchored in goal
Date: Wed, 06 Feb 2002 10:50:30 -0500
 - new function fastlib() helper for approxlib family.
 - a pattern can now force the anchor point.
 - matchpat can be run forcing anchor to be in the goal.

The pattern matching changes are in preparation for another revision
to the EXPERIMENTAL_READING (pattern-based tactical reading) code.

The speed improvement by forcing the anchor to be in the goal are
really big, and it might be worth considering doing the same with
the owl patterns.

The main pattern diagram now accepts two new characters: P & Y
(P follows O, Y follows X).  P is the same as O, but that this
point must be the anchor.  Likewise, for Y & X.

Here's sample from my local read_attack.db:

Pattern RA200




;olib(a) == 1

Pattern RA201

YO    backfill



;lib(A) == 2 && olib(*) >= 2

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