England booked their place in the last eight by beating Argentina, Wales can secure their spot on Wednesday and there are big games coming up for Scotland and Ireland.

So what are the permutations in each pool? BBC Sport takes a closer look.

What are the rules?

Teams receive four points for a win and two for a draw. A bonus point is awarded for scoring four tries or for a defeat by seven points or fewer.

The winner and runner-up in each pool qualify for the quarter-finals.

If two teams are tied at the end of the group stage then the winner of the match between the two teams will be ranked higher.

If two or more teams are tied then points difference will be used to separate them with various other eliminators used if points differences are equal.

Pool A

Scotland v Russia (9 October): Scotland must win on Wednesday to move closer to Ireland and Japan, but Gregor Townsend's side will not be happy with anything other than a bonus-point victory.

Ireland v Samoa (12 October): Ireland will qualify for the last eight with a bonus-point victory, given Scotland could not match the 16 points they would then have. Realistically, given Ireland's points difference, victory without a bonus point would also secure a quarter-final spot.

In the case of Japan, Scotland and Ireland finishing on the same number of points, the quarter-final places would be decided on points difference. The teams' head-to-head record is the initial tie-breaker - however, Japan, Ireland and Scotland would have won one and lost one of their matches against the other two.

Japan v Scotland (13 October): Japan moved back to the top of the table with victory over Samoa and a win against Scotland would put them through to their first World Cup quarter-final.

Scotland would have to beat the Brave Blossoms to progress, with bonus points possibly proving decisive.

If Scotland win and both sides finish on the same points, Gregor Townsend's side would progress by virtue of winning Sunday's match.

Pool B

South Africa became the first team from Pool B to reach the quarter-finals after they beat Canada 66-7 on Tuesday.

New Zealand v Italy (12 October): New Zealand are not yet mathematically through to the knockout stages. Italy would have to beat the All Blacks in their final game to progress, and even that may not be enough if Steve Hansen's men claim bonus points.

Pool C

England v France (12 October): England and France have both sealed their qualification to the last eight but the Six Nations rivals will meet on Saturday to determine who will go through as group winners.

Pool D

Wales v Fiji (9 October): For Wales, it's simple. Beat Fiji on Wednesday and they seal their progress to the next round. Defeat for Wales would see Fiji move above them.

That would leave Wales, Fiji, Australia, and theoretically Georgia with the chance to reach the knockout stage with the last two fixtures to be played.

Australia v Georgia (11 October): Australia will progress if Wales beat Fiji on Wednesday, or if the Wallabies win their final pool game against Georgia.

Remaining fixtures:

• Wales v Uruguay (13 October)

Knockout stages - who plays who?