ARLINGTON, Va. — Twice in the Capitals’ last three games, one of the most important plays of the night was made by neither a coach on the bench nor a player in the ice.

The play — successfully challenging a goal for offside — was made in a small coaches office outside of the dressing room. That’s where Brett Leonhardt and Tim Ohashi sit during games. They’re Washington’s video coaches, and they’re watching everything, including each time the opposing team carries the puck into the Caps’ zone, on multiple screens.

Was the entry onside? Was it offside?

Most times, the answer is immaterial. On occasion, though, it requires a quick decision that could swing a game’s momentum and, perhaps, alter the outcome.

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