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					Originally Posted by  nopachunts
					 
				 
				Where's the BU in your screen shots?  If they are using a three man crew, shouldn't U1 be closer to 1B shoulder of F4?  Trying to learn softball mechanics. 
			
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Although that is an unrelated to the OP, the mechanics by this crew are not standard NFHS (the first play had U3 "rotating home" when U1 chased; there was another play where U1 turned and looked, but didn't chase).  
The pre-pitch positioning for U1 with a runner on second is to use either shoulder of F4, where I prefer to use the right shoulder.  Your responsibilities (in part) is to cover the pick off at second, and cover first/second if U3 does not chase.  Where you choose to position yourself is where you are comfortable.