Re: [gnugo-devel] Connection point not seen (D1320b)

[SP LEE]

Sorry, not O15, but P14 was considered not strong enough by GNUGO.

----- Original Message ----- 
From: "SP LEE" <address@hidden>
To: "GNU Go development" <address@hidden>
Sent: Thursday, June 05, 2003 10:35 AM
Subject: Re: [gnugo-devel] Connection point not seen (D1320b)


> Attached is a game I just played with the latest GNUGO (from the cvs). There 
> was an obvious blunder on move 158, where GNUGO thought its group L9 is 
> dead, while this group can be simply connected with outside on O14. In GTP 
> mode, owl_attack L9 showed that O14 is an attack point. However, it didn't 
> even consider the move O14 in "owl_defend L9" and thought the group L9 is 
> dead without any defense. O14 is generated by the move generator, but almost 
> without any value.

I found that GNUGO did find D1320b for O14. However this move was discarded 
because the neighboring dragon (O15) is not strong enough (only one eye was 
seen ;) ). As I had suspected, it seems that the pattern needs to be revised 
instead of adding more patterns. 

I think 'strong dragon' may not have clearly two eyes, especially it's hard for 
GNUGO to find where these two eyes are. Even if it has only one eye, and the 
dragon under attack has one eye, it's crucial to connect two dragons together. 
I would suggest to read the liberties as a measurement for 'strong'. Maybe 
liberties against number of stones.

Please comment.

SP Lee


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