in reply to Re: YAPC::EU::2013 reg.ru Go Perl golf contest
in thread YAPC::EU::2013 reg.ru Go Perl golf contest

Variable-length negative look-behind can be emulated using \K. The two regexes are almost identical, and can be abstracted in a variable. "@-" is shorter than "$-[0]". If using perl >= 5.14, /./ followed by "$& $'" can be replaced with s/./$& /r.

All in all, that's 30 characters easily chipped off. There’s still a lot of room for improvement—this next is hurting my eyes. I’ll probably look at it some more another day.

#!perl -ln0
$:='(.{9}|)\Kw|w(?=(.{9}|)';
map{$i="@-"+11;{map{1while
s/W$:W)/W/s;/ \U$: )/s||print($i=~s/./$& /r)+next}"$`W$'"while/w/g}}"$
+`x$'"while/ /g

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Re^3: YAPC::EU::2013 reg.ru Go Perl golf contest
by Grimy (Pilgrim) on Aug 22, 2013 at 11:44 UTC
    Another 22 characters shaved off: 
    #!perl -ln0
$:='((?=W|.{9}W)|(?<=W.)|(?<=W.{10}))';{1while s/w$:/W/s;/ $:/gs>//gs&
+&print+("@-E-1"+1)=~y/./ /r;y/W/x/;s/w/W/&&redo}

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    EDIT: Down to 109. I’m starting to like it, but we can likely get this under 100. 
    #!perl -ln0
$,='((?=.(.{9})?g)|g(.{9})?\K)'until!s!$,w!g!s;$,=/$, /gs>//gs&&!map!y
+!.! !>print,"@-e-1"+1;y&g& &&&redo

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    EDIT2: While my first solution was correct, both solutions in this post have the same problem: if playing a single black stone captures multiple white groups, this move is printed multiple times. Here’s a 127 stroker that prints each move only once: 
    #!perl -ln0
map{1while$,=s=$,w=g=s?'(g|(?=.g|..{9}g)|g.{9})\K':/g/>/$, /s&&map{y!.
+! !;print;redo}/x/+"@+E-1"or y&g&b&}"$`x$'"while/ /g

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