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Bill Belichick became a football savant long before he was head coach of the Patriots. His education in football dates back to the 1950s, when Bill was just a tyke and his father, Steve Belichick, was an assistant coach at Navy.

For this year’s Army-Navy game, CBS brought together Bill Belichick and perhaps the best player his late father coached at Navy, Heisman Trophy-winning halfback Joe Bellino, and asked Belichick to diagram one of Bellino’s plays.

Although Belichick was 7 years old in 1959, he had no trouble diagramming a play from that season, 27 F Trap.

“I remember my dad sitting there going through the film, talking about if the tackle is split a little wider, if the back is in T formation, halfback-fullback-halfback, a lot of teams run it straight, if the back is tilted up run to that side, if the back is tilted back, run away. Teams ran the Power-I formation. He would show it on the film: On this play the back is split it’s going to be here. On this play he’s not split it’s going to be there. The same thing defensively: When the defensive lineman would stunt down he’d go outside, when he’d not stunt he’d play it straight. That’s where I started to learn to identify line splits, backfield alignments, wide receiver splits to run crossing routes from tight splits and things like that.”

Although the game has evolved a lot since the 1950s, Belichick said 27 F Trap isn’t much different from a handoff to LeGarrette Blount the Patriots could run in their 2016 offense.

“Football is football,” Belichick said. “Off tackle power? Every team in the league runs off tackle power.”

But not every team has a coach whose education in the off tackle power dates back quite that far.