Format
The format of the 1966 competition remained the same as 1962: 16 qualified teams were divided into four groups of four. Each group played a round-robin format. Two points were awarded for a win and one point for a draw, with goal average used to separate teams equal on points. The top two teams in each group advanced to the knockout stage.
In the knockout games, if the teams were tied after ninety minutes, thirty minutes of extra time were played. For any match other than the final, if the teams were still tied after extra time then lots would be drawn to determine the winner. The final would have been replayed if tied after extra time. In the event, no replays or drawing of lots was necessary.
Read more about this topic: 1966 FIFA World Cup