Just for the record, here's a fairly straightforward one treating the score as a string.  It replaces '/' with the appropriate count and dupes the following char (unless it's an extra ball), replacing X with x to avoid processing the X twice.  Then it dupes the 2 chars following each X (again, except for extras), and tallies.  It passes all of the above tests and comes in at 96 chars:
sub score {
  $_=pop;                                                       #  7

  s#(.)/(?=(.).|.?$)#$1.($1?10-$1:'x').lc$2#ge;                 # 45

  s/X(?=(..).)/X$1/g;                                           # 19

  y/Xx/9/+eval join'+',/./g                                     # 25
}
#                                                                ___
#                                                                 96

[download]
Only one problem, it fails for a strike in the 9th frame and no extra balls in the 10th!  /X\d\d$/ matches either. (Also, there's no agreement on whether the args passed in have to match the orginal @b example.) Patching for those makes it 123 :-( :
 
sub fullscore {
  $_=join'',@_;                                                 # 13

  s/^(X|\d.){10}$/$&0/;                                         # 21

  s#(.)/(?=(.).|.?$)#$1.($1?10-$1:'x').lc$2#ge;                 # 45

  s/X(?=(..).)/X$1/g;                                           # 19

  y/Xx/9/+eval join'+',/./g                                     # 25
}
#                                                                ___
#                                                                123

[download]


  p

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

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.