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Doing it with substitutions
sub bowlscore { my $t; $_=join(',',@_); while(s/X,X,X/30,X,X/){} s!X,X,(\d)!20+$1.",X,$1"!eg; s!X,(\d),(\d)!10+$1+$2.",$1,$2"!eg; s!X,\d,/!20,1,/!g; s!\d,/,(\d)(\b)!10+$1.",$1$2"!eg; s!\d,/(?=,\d\d)!20!g; s!(\d\d)(,\d){1,2}$!$1!; map($t+=$_,split(/,/)); $t; }
223 chars not counting the unnecessary whitespace for the body of the function. It's not the lowest bytecount here, but at least it's lower than my bowling highscore.

Update: This fixes a bug pointed out by dragonchild
sub bowlscore { my $t; $_=join(',',@_); while(s/X,X,X/30,X,X/){} s!X,X,(\d)!20+$1.",X,$1"!eg; s!X,(\d),(\d)!10+$1+$2.",$1,$2"!eg; s!X,\d,/!20,0,/!g; s!/,X!20!; s!\d,/,(\d)(\b)!10+$1.",$1$2"!eg; s!\d,/(?=,\d\d)!20!g; s!(\d\d)(,\d){1,2}$!$1!; map($t+=$_,split(/,/)); $t; }
10 chars added.

And another correction:
should be
for multiple spare frames in a row to work.

In reply to Re: (Golf) Let's go bowling by nardo
in thread (Golf) Let's go bowling by virtualsue

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