Quote:
	
	
		| Originally posted by cbfoulds 
 Bob: I guess I don't see the "illegally alters the actions of a fielder ..."  part.
 
 
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 That's not (necessarily) a requirement for a FPSR violation.
Take a more common / obvious play.  F6 comes across the base, moves a step toward right field and throws to first.  R1 tries a "take out" slide toward F6, but misses him.
No one would have a problem calling this a FPSR violation, but there was no "illegally alters the actions of a fielder".
If the runner goes beyond the bag, or executes a roll block, then contact is needed.  If the runner slides in a direct line between the bases, then contact is ignored.  If the runner doesn't slide or run away, then contact isn't needed.