https://operations.nfl.com/the-rules/2019-nfl-rulebook/#article-3.-defensive-team-formation
9-3-2
Field Goal or Try Kick Formation. When Team A presents a field goal or Try Kick formation:

A Team B player, who is within one yard of the line of scrimmage, must have his entire body outside the snapper’s shoulder pads at the snap.

No more than six Team B players may be on the line of scrimmage on either side of the snapper at the snap.
Penalty: For illegal formation by the defense: Loss of five yards.


オフェンスがFGフォーメーションのとき、スクリメージラインから1ヤード以内にいる守備側の選手は、
スナップ時に体全体がスナッパーのショルダーパッドの外側でないといけない。