This is a great golf challenge!

Here's my best solution: 

sub score {
my$s;sub S{$_[0]=~X?10:$_[0]}$s+=($l=shift)=~X?10+($_[1]eq'/'?10:S($_[
+0])+S$_[1]):($r=shift)eq'/'?10+S$_[0]:$l+$r for 1..10;$s
}

[download]
126 characters. (Or 125, if $r is replaced by a punctuation variable, since a space could then be eliminated.)

During a Chatterbox discussion, tye suggested using a regex to parse the score. This sounded promising, but unfortunately I ended up with a longer solution. 

sub score {
$"=my$s;sub S{$_[0]=~X?10:$_[0]}$S="@_";$S=~/(X)(?=(.)(.))|(.\/)(?=(.)
+)|(.)(.)/g,$s+=$1?10+($3eq'/'?10:S($2)+S($3)):$4?10+S($5):$6+$7for 1.
+.10;$s
}

[download]
145 characters.

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

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