[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [gnugo-devel] invasion question

From: nando
Subject: Re: [gnugo-devel] invasion question
Date: Fri, 1 Dec 2006 17:05:19 +0100

On 12/1/06, alain Baeckeroot <address@hidden> wrote:

It seems that GNU Go very often miss "classical" invasions
below 4 th line too streched B stones (like in H9 game)

A quick test seems to show that there is no pattern for such invasion

Unfortunately, GNU Go isn't fantastically strong at life & death, not
to mention sabaki. So it's probably on purpose that such patterns are

(...) And i saw a rather big malus for invasion moves (near 10 points)

Correct. See strategic_penalty() in value_moves.c

Is it done on purpose ? (to prevent hasty invasion which fireback)


Is it worth digging, and adding test cases (i found less than 10 invade test)

Possibly. IMHO a serious approach of this issue would have to start
with the creation of a new primitive, something like owl_invasion (and
possibly owl_threaten_invasion). That would allow to more solidly test
pattern-generated potential invasion moves. Then we could use the
result to value the moves more properly (the penalty should still
apply I think). But I doubt a bit that the engine is up to such a task
for the moment.

Loosely related: GNU Go also almost totally lacks reduction moves generators.

-- nando

reply via email to

[Prev in Thread] Current Thread [Next in Thread]