Re: [gnugo-devel] current regression failures

[Trevor Morris]

>> > trevor:381 (atari_atari)
>> > This actually passed before due to a bug in the atari_atari code. Now
>> > the main problem is with an incorrect reverse followup value.
>> Indeed there seems to be a duplication. OTOH, I think E8 is fine and
>> should be added to the correct answers.
>
>It's clearly worse for ko threats than D7 and slightly worse than C7,
>but it doesn't lose a point like C6 (the game move). I'll add it and
>let Trevor remove it later if he doesn't agree.
Not too worried about Ko threats.  We'll regress over that later
(maybe in a few years?)

>> > trevora:120 (atari_atari)
>> > Various valuation mistakes. However, the previous move at E17 isn't
>> > satisfactory and shouldn't be listed as correct. Or am I missing
>> > something?
>> I come to yet another conclusion :-)
>> I think that B8 is the correct move. W can answer E7 with E8 and then D8
>> with D9. Compared to D8, this only gives up two points around D8, yet
>> B8 secures B7 and A6 (not B5 due to a shortage of liberties, but B5 cannot
>> be saved anyway unless I am missing s.th. again).
>
>I think B5 can be saved after B8, but only through a huge ko. After
>D8, E8, or E7, there's no defense at all for B5 and ko for B7 and A6.
>It seems I agree with Arend that B8 is best. Trevor, what's your
>opinion?
I'll buy that B8 is OK, then let's delete this problem, but you'll
see that GNU Go doesn't get the followup, so is actually much worse
off.  See the attached (unnumbered) patch.



Index: trevora.tst
===================================================================
RCS file: /cvsroot/gnugo/gnugo/regression/trevora.tst,v
retrieving revision 1.3
diff -u -B -b -r1.3 trevora.tst
--- trevora.tst 2001/11/30 14:42:02     1.3
+++ trevora.tst 2001/12/06 19:47:22
@@ -15,10 +15,14 @@

 # games/trevor/auto/a003.sgf problems:

-loadsgf games/trevor/auto/a003.sgf 28
-120 gg_genmove white
-#? [E7|D8|E8]
+# OK, B8 is fine.  Followup is important.  See trevora:121
+#loadsgf games/trevor/auto/a003.sgf 28
+#120 gg_genmove white
+##? [E7|D8|E8]

+loadsgf games/trevor/auto/a003.sgf 30
+121 gg_genmove white
+#? [E8]