Casual Players

This is little bit of topic but I feel like it can slip. I've seen alot of -11 -15 -21 etc. I am guessing they are frames so for example - Yoshi's iMFC is an i11 so that would be able to interrupt anything Maxi would do after 6a, am I right?
iMCF is i10
 
I know it's -3, that's why I said effectively. Didn't know neutral guard GId in time tho
 
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