[gnugo-devel] Death by Magic Sword

[Michael Goetze]

Hi,

I've been having GNU Go (3.3.18) play some games against itself, and
found a case where a non-joseki local move got a higher score than the
local joseki move:

  C13: 11.27 - change in territory
  C13: 10.19 - strategic effect on D16
  C13: 6.22 - strategic effect on E14
  C13: 6.16 - strategic effect on D12
  C13:   6.45 - total followup value, added 6.45 as territorial followup
  C13: 3.22 - added due to followup (6.45) and reverse followup values (0.00)
Move generation values C13 to 37.06
  C14: 5.74 - change in territory
  C14: 7.17 - strategic effect on D16
  C14: 5.16 - strategic effect on E14
  C14:   6.91 - total followup value, added 6.91 as territorial followup
  C14: 3.46 - added due to followup (6.91) and reverse followup values (0.00)
  C14:   35.00 - minimum accepted value
Move generation values C14 to 35.00

This led to a rather large B group dying later on. W did spend a few too
many moves killing it, though, while B was getting big fuseki points.

Another interesting move is W92. I think W should have played a more
severe move such as F8, F6, G6, etc. - this could make a difference of
50 points or so. Of course, I am only a lowly 12kyu and suck at
counting, so I might be wrong. ;)

As it is the move actually played (H10) was given the same score for
"strategic effect on C8" as F8, whereas IMHO the effects are very much
different.

In any case, I have attached the game as an SGF, with the "correct"
joseki (according to Kogo's Joseki Dictionary) added as a variation.

- Michael

PS Is there any chat place (such as IRC) where GNU Go developers hang
out?

-- 
<joeyh> netgod: er, are these 2.2.0 packages 2.0.0pre9 or do you have a
        direct line with the gods?
<netgod> joeyh: i have the direct line

magicsword.sgf
Description: application/go-sgf

pgpNPbEShggb_.pgp
Description: PGP signature