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The only time I have heard using the chains for enforcement is when there's a foul by B and the end of the run is just +/- 15 yards. The mechanic is to bring the chains straight out as if measuring for a first down. Then while keepint the REAR rod in place, walk the FRONT rod backwards and stretch the chains BACKWARD. If the ball is inside the 5-yd tape mark then you know a 15-yard walkoff will result in a 1st down. It's not a bad mechanic although I haven't had to use it yet in my 5 years at the varsity level.
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