I think the FPSR needs to be re-written to be much more clear. The language is ambiguous and spread all throughout the rule book, mixed in with regular runner interference. It is extremely difficult to understand the rule and apply it consistently without a lot of reading of the rule book, case book, mentoring, and trial and error. There are two aspects to the FP/SR: On a Force Play, the regular Slide Rule gets ONE additional requirement -sliding directly into the base. INTERFERENCE on a Force Play (not JUST slides (See CB 8.4.2W, haha)), gets two additional penalties -BR also out,and runners return to TOP (8-4-2b) (different for regular runner interference, which is TOI - (8-2-9)). I could be right, or wrong on the details above, duh, because the rule is hard to understand, duh, but this is how I enforce it, in my games, until I don't. Anyway, IMO, the most confusing rule in the NFHS rule book. The intent of the rule is simple I am sure, but they don't make it easy.