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Another option is to use a reverse measurement to determine if the ball will be beyond the line. Just grab the chain at a yard line and bring it onto the field. Then depending on what the penalty yardage is (5, 10, 15) and move the chains backwards. If the ball is in advance of the front stake then you know it will be a first down after you walk off the yardage. If it's short, grab the spot on the chain and move the chain the penalty distance and spot the ball at that spot.
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