[gnugo-devel] Dragon safety early in the game

[bump]

GNU Go often neglects groups in the opening or early
middle game. Examples of what I mean are century2002:50,
or the tenukis in games/cgf2002/gnu-har.sgf at moves 19 and 21.
GoFuN was often able to surround a group at a distance then
kill it. And this happens all the time in 9 stone games
against strong players.

If we can identify these situations then we can increase
the strategic effect of defensive moves and fix this problem.

One possibility is that we try to use the dragon2.weakness field, 
which Arend introduced around 3.3.4 to identify these weak dragons.
This field needs to be better documented I think. As far as I know
it isn't used much yet and maybe Arend has ideas about using it
more. We should figure out whether that is an adequate measure 
for this problem, and if not, maybe it can be improved.

Maybe we can make some scheme based on Evan's matcher_check to
test and tune the search for weak dragons. Namely, we load sgf
files move by move and have GNU Go identify dragons it thinks
are weak. Then a human looks at the results. When the human
starts to agree with the output, then we go back and revise the
strategic effect.

Dan