Nigeria U17 coach Emmanuel Amuneke says his decision to stop Chile from dominating the midfield resulted in their emphatic victory over the hosts on Tuesday night.
The Flying Eaglets booked a place in the second round of the FIFA U17 World Cup after they thrashed the South Americans 5-1 in the game in Santiago.
Nigeria now have six points from two games after Samuel Chukwueze and Victor Osimhen scored twice each while Kelechi Nwakali grabbed the other.
Chile captain Allende scored his side's consolation goal in the 81st minute.
Amuneke says the decision to block the Chileans from dominating the midfield resulted in their massive victory over the home side.
"It is true we were effective up front, but we also knew how to block their passing game, forcing them to play uncomfortably in the midfield," Emmanuel Amuneke, Nigeria coach.
"My players understood the transition game, that is when to attack, when to defend. We also prepared them mentally, it is not easy to play against the host.
"Chile has a god team, but today they lost against the best team. I believe they can qualify for the next round."
Nigeria will play their last group match on Friday.