The following is a look at the qualification and elimination permutations for each pool at Rugby World Cup 2015.
Australia and Wales have qualified for the quarter-finals and for RWC 2019.
England, Fiji and Uruguay have been eliminated.
Australia will finish top of Pool A if they avoid defeat by Wales on 10 October, unless it’s a draw in which only Wales earn a bonus point for four tries.
England will finish third in Pool A if Uruguay take no points from their match against Fiji on 6 October or if England avoid defeat by Uruguay on 10 October.
Fiji cannot finish higher than fourth in Pool A.
None of the teams in Pool B has qualified for the quarter-finals. South Africa are guaranteed a top-three finish and have qualified for RWC 2019.
Samoa and USA have been eliminated.
South Africa will qualify for the quarter-finals and finish top in Pool B if they defeat USA on 7 October.
Scotland will qualify for the quarter-finals if they beat Samoa on 10 October or if Japan fail to beat USA on 11 October (provided that it is not a bonus-point draw for Japan).
Samoa can finish in third place only with a bonus-point win against Scotland on 10 October and if Japan gain no points against USA on 11 October.
To remain in contention for third place, USA need at least three points from their match against South Africa on 7 October.
New Zealand have qualified for the quarter-finals and for RWC 2019.
Georgia have been eliminated.
New Zealand will finish top in Pool C if they pick up at least one point against Tonga on 9 October.
Argentina will qualify for the quarter-finals if Namibia do not get a bonus-point win against Georgia on 7 October and if Tonga fail to beat New Zealand on 9 October. Should neither event occur, Argentina need to pick up at least one point against Namibia on 11 October.
Tonga can qualify only if they beat New Zealand on 9 October. If Namibia do not get a bonus-point win against Georgia on 7 October, Tonga need a bonus-point win against New Zealand to have any chance of reaching the quarter-finals.
Georgia can still finish in third place, but they need at least two points from their match against Namibia to remain in contention for that spot.
Namibia can still mathematically finish anywhere from second to fifth. If they fail to secure more than a point against Georgia on 7 October, they are guaranteed to finish bottom of the standings in their pool.
Ireland and France have qualified for the quarter-finals and for RWC 2019.
Italy, Canada and Romania have been eliminated.
Ireland will finish top in Pool D if they avoid defeat by France on 11 October, unless it’s a draw in which only France earn a bonus point for four tries.
Canada are guaranteed to finish in fifth place following their defeat against Romania on 6 October.
Any Romania victory against Italy will mean a third-place finish for Romania and qualification for RWC 2019. Any other result means Italy will finish third.