Explainer: The equation for our Caltex Socceroos

Now that the Socceroos have defeated Thailand 2-1, the equation for the Aussies to qualify automatically to Russia 2018 is very simple.

REPORT: Late drama as Caltex Socceroos see off Thais

WATCH: Caltex Socceroos v Thailand highlights

As we wait for kick off at 3.30am (AEST) in the deciding game of Group B between Saudi Arabia and Japan in Jeddah, here’s what you need to know.

WHAT YOU NEED TO KNOW

Japan has qualified as top side in the group and are going to Russia 2018

The Saudis and Aussies are jostling for second spot, the all-important other automatic qualification spot.

Australia currently have 19 points from their 10 games, the Saudis have 16 points from nine games.

The regulations state the rankings of teams is based on the following criteria in this order.

1.     Points

2.     Goal difference

3.     Goals scored

4.     Points in matches between tied teams

5.     Goal difference in matches between tied teams

6.     Goals scored in matches between tied teams

7.     Away goals in matches between tied teams

WHAT DOES THIS MEAN?

If Saudi Arabia defeat Japan, the Saudis will qualify automatically as they’ll have a better goal difference.

If Saudi Arabia draw or lose to Japan, Australia will qualify for Russia 2018.