England, Ireland and Wales are all contenders to take the Six Nations title on Saturday.
The top three are locked on six points with three wins apiece but England's points difference puts them first, ahead of Ireland and Wales.
France are fourth with four points and a points difference of +22.
If teams are level on both points and points difference, then England should win the Championship because they have scored more tries than their rivals. They have 11, while Wales have five and Ireland just four.
In the very unlikely event that teams are level on points, points difference and tries scored, the trophy will be shared.
Wales v Italy, kick-off 12:30
Wales have recovered from a poor start to haul themselves back into title contention.
But victories against Scotland, France and Ireland have given them a chance of lifting the Six Nations trophy again.
The odds are against Wales. They travel to Italy with the daunting task of having to win but knowing that might not be enough should Ireland beat Scotland or England win against France.
They need to win by at least 26 points to better England's points difference, while a 22-point victory is required to leapfrog Ireland.
Ireland v Scotland, kick-off 14:30
Ireland still have a strong chance of winning the title.
They are away against winless Scotland but after losing to Wales, Irish confidence may be dented.
Ireland make two changes from the Wales defeat, as winger Luke Fitzgerald comes in for Simon Zebo and loose-head prop Cian Healy replaces Jack McGrath.
They have the benefit of knowing what Wales will have done, but must win well to put England under pressure when they face France.
England v France, kick-off 17:00
England have the advantage of playing last, as well as a superior points difference, so they will know what they have to do.
England have not won the title since 2011. But, against an underachieving French side, they will be hopeful of ending that wait.
If the Irish and Welsh both lose their matches, then the match at Twickenham effectively becomes a title decider.
Although England will be favourites, should both Wales and Ireland lose, then France could pull off the unlikeliest of title heists.