Major Rule Changes 1945
On December 17, 1945 he inbounds lines or hashmarks were moved closer to the center of the field, from 15 yards to 20 yards from the sidelines (from 70 feet apart to 40 feet apart). This remained the standard until 1972, when the hashmarks were moved in to the width of the goalposts, 18½ feet apart.
The player who extends his arms under the center must receive the snap or the offensive team will be penalized for a false start.
When a snap is muffed by a receiving player and then touches the ground, it is legally a fumble which may be advanced.
During an extra point attempt, the ball is spotted at the 2-yard line, but the offense may opt to have it be placed further from the goal line.
A kicked ball which travels beyond the line of scrimmage and is recovered by the kicking team anywhere in the field of play after touching a member of the receiving team becomes 1st-and-10 for the recovering team.
Referees to designate the offending player in a penalty call when known
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