"Obvious try" - The FOUR most debated referee decisions at Rugby World Cup's

Even in an age of advanced technology, numerous contentious situations continue to arise.

In the subsequent slides, we examine the four most hotly debated refereeing choices throughout the year's premier sporting event.

Sam Warburton, a Welsh rugby legend, received a red card in the first half of the 2011 Rugby World Cup semi-final against France.

Warburton, who played as an open side flanker, was shown a red card by referee Alain Rolland in the 18th minute of the match for a tackle on French winger Vincent Clerc that Rolland deemed worthy of a straight red.

The decision was met with outrage from commentators and pundits, but both Warburton and Wales head coach Warren Gatland, while expressing their disappointment, remained gracious in defeat after France secured a 9-8 victory in Auckland.

This controversial decision, which many believe cost Wales a place in the final against the All Blacks, remains one of the most debated calls in the history of rugby.

Scotland were heavy underdogs in this game and yet a Mark Bennett interception try with seven minutes to go, seemed to have given Scotland the victory and place in the semi finals.

With 2 minutes left to play, Scotland make a hash of their lineout, the ball bobbles around a few times and Joubert awards a penalty to Australia for Scotland playing the ball in an offside position.

At the time, the TMO couldn’t be used to review these sorts of incidents, so Craig Joubert was left to make a decision based on what he saw in that split second. Unfortunately for him, the penalty incident was replayed on the big screen as the kick was taken and the crowd could see the ball had hit an Australian player.

The game finished with Joubert beating a hasty retreat from the ground, after Foley had kicked the penalty to give Australia a 35-34 point victory.

World Rugby later released a statement saying that Joubert had got it wrong.

Many Kiwis still haven't gotten over Barnes' performance in the 2007 RWC quarter-final against France.

Barnes missed a clear forward pass from Damien Traille to Freddie Michalak in the lead up to a France try.

It led to the All Blacks' earliest ever exit from a World Cup.

Matthew Tait sliced open the Boks defence and hurtled towards the line. Andy Gomarsall moved it quickly to Mark Cueto on the left wing who dived through the tackle of Danie Rossouw and over the line.

Alain Rolland called for the TMO. It was tight. Impossibly tight. No try.

England were instead awarded a penalty which Wilkinson slotted, and roused by Cueto’s diving effort they had the momentum.

But the Springbok nut was impossible to crack. Montgomery’s boot kept a huffing and puffing England at bay, guiding his side to a 15-6 win.

South Africa were deserved World Champions, England the plucky, dethroned former kings.

But if Cueto’s ghost try had stood, it all could have been so different.