Here's a step-by-step breakdown of the play and the factors the on-field CFL officials had to consider in the heat of the battle on the final play of Montreal's 37-30 win over Toronto on Friday night:

1) Is Montreal kicker Damon Duval's field goal good? Usually this is easy to answer, but what adds to the difficulty is the height of the kick and its location. A kick that's short or goes through the uprights is easy to decide upon. It's much trickier to determine if a towering boot to the left or right is inside the uprights. But in this instance it was clear to the two officials under the goalposts Duval's attempt was wide.

2) Toronto's Mike Bradwell, punter Noel Prefontaine and backup kicker Shaw are all in the end zone awaiting Duval's kick. When it sails wide, Bradwell goes high at the back of the end zone to prevent the ball from sailing out of bounds for a single. If he had come down with it, officials would have to determine if Bradwell did so in bounds, because if he hadn't, Montreal would have been awarded the game-winning single. But because the officiating crew was short one, there wasn't anyone standing at the back of the end zone to see Bradwell was out of bounds on Duval's kick then came back into the field of play to punt the ball out. Bradwell could have been called for illegal participation but in the end it was moot because the right decision on the field had been made.

3) Upon Bradwell's kick, though, Toronto becomes the punting team and must give Montreal five yards to gain possession. Duval settles under it at the Argos' 22-yard line and game officials had to determine whether he's been given the necessary five yards. He had and punted the ball back into the home team's end zone.

4) If Duval's punt sails through the end zone, the Als would have been awarded the single for a 31-30 win. It didn't but the ball was still bouncing around, creating the possibility of it taking a weird hop and going out of bounds, which again would give Montreal a single.

5) The Argos become the receiving team, meaning Montreal must give five yards to let them take possession. If the Als are called for no yards, the ball comes out of the end zone and the game heads into overtime.

6) Argo Grant Shaw can't field the ball cleanly but, like a catcher blocking a wild pitch, does a nice job of sliding and letting it hit him and remain in play rather than potentially skipping out of bounds for the single. Shaw then tries to kick the bouncing ball out of the end zone and manages to contact it with his foot but couldn't get it out. As a result, though, it's now a free ball.

7) Toronto must not only recover the ball but get it out of the end zone to force overtime. Montreal has to not only prevent this, but also safeguard against the Argos possibly returning it the entire length of the field for the victory. After the ball bounces off various players, Dahrran Diedrick corrals it to secure the wild win for the Als*.