Re: [gnugo-devel] Olympiad games

[bump]

On July 10, discussing
regression/games/olympiad2002/game1-19-goint-gnugo-1-0.sgf
Gunnar wrote:

> The major problem was J15 (91) which must be at R12. There's no
> discussion that the owl reading made a major mistake, thinking J15 was
> an owl defense for L15. This was partly caused by, unusually enough,
> an underamalgamation. With --experimental-connections L15 and Q14 are
> correctly amalgamated, but then it instead fails to find an owl attack
> at all.

The failure to amalgamate using standard connections can be corrected
with the following patch. This seems a pretty basic missing
connection pattern! However after the amalgamation is correctly
recognized, no attack is found because we run out of owl nodes.

Dan

Index: patterns/conn.db
===================================================================
RCS file: /cvsroot/gnugo/gnugo/patterns/conn.db,v
retrieving revision 1.25
diff -u -r1.25 conn.db
--- patterns/conn.db    12 Jun 2002 15:35:06 -0000      1.25
+++ patterns/conn.db    19 Jul 2002 19:07:45 -0000
@@ -1185,6 +1185,19 @@
 ;attack(A) && attack(B) && !oplay_defend_both(A,B)
 
 
+Pattern CC208
+
+OX
+.O
+
+:8,CW
+
+OB
+aO
+
+; xplay_attack_either(a,a,B)
+
+
 #############################################
 #
 # CC3xx - patterns with expensive constraints