In case you're curious as to what my early-lead 60-stroke solution looked like, here it is:
y/DCLXVIM /4 DCLX9/,$\=s/( )?\d/9x($&+!$1)/egfor(<>)x4;print
This is quite a different algorithm from yours, I think.
I enjoyed the few days I was thinking about this challenge, but I don't have the tenacity to keep whittling away month after month like you serious golfers.
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