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Nicol criticizes Liverpool's back line in loss to Manchester United (1:18)

Steve Nicol criticized the back line of the team and explained why they didn't meet expectations. There is a time and a place for it.

5:35 AM ET

Video assistant referee causes controversy in the premier league but how are decisions made and are they correct

We explain the VAR protocol and the Laws of the Game when there is a major incident.

The VAR decisions affected every club.

- VAR's wildest moments: Alisson's two red cards in one game

- VAR in the Premier League: Ultimate guide

Manchester United 2-1 Liverpool

There is a chance that the goal is possible to be interfered with.

Marcus Rashford scored Manchester United's second goal when Anthony Martial played him through on goal. When the ball was played, there was a question of who was in front of Joe Gomez.

The goal stands.

There were close calls over the weekend, including two goals that were not allowed. The goal stood because of a change in the way VAR is used to determine whether or not a player is onside.

The current VAR offside system has several flaws, mostly around the exact time the ball is played and the manual plot of points on the attacker and defender. The benefit of the doubt would be given back to the attacker. The attacker should be given on side if the two lines touch.

The goal was to get rid of the most marginal calls. Two years ago, Jordan Henderson's injury-time winner for the Reds against the Toffees was called in the build-up by the linesman. The "benefit of the doubt" rule was created due to a situation with no gaps between the lines.

The margin of error is 5 cm back to the attacking player, meaning they can be in front of the defender but the goal won't stand because of the system's errors.

When a player is onside due to the tolerance level, the computer only shows the line to the defender, which is green in the premier league. The line is not displayed to the two players because they sit on top of each other.

The "benefit of the doubt" made him onside.

The human eye can't see a 3D situation on a 2D image. Depending on the angle of the camera, one player may be in front of the other. The fans don't trust the results. SAot will be used in the World Cup and first in the European Championship.

The big VAR fix is expected to be semi-automated offside.

The rule has led to goals being conceded in recent games by Man United.

On the opening day of the season, Danny Welbeck was slightly ahead of Harry Maguire before setting up Pascal Gross for the first goal of the game.

At the end of the last season, Pukki was able to tie the game for the Canaries.

This decision is different from other decisions this weekend. Every image is unique. There's no reason to argue that Gabriel Jesus' goal for Arsenal against Bournemouth should have been allowed. The position of two players in an individual situation is what determines it.

There will still be situations on the border even with the tolerance level being 5 cm. There will always be a point when onside has to be in a position to make a decision. It's not a question of if, but when. The Jesus goal is very close. The high-definition graphics used by the VAR are much more clear than the blurry images on social media.

The lines don't touch in the Jesus image. It has to be done. The Jesus goal should be onside if we say so. There will be other goals which are 7 cm off the ground.

Ivan Toney's goal was close to the tolerance level, but it wasn't quite as tight as the Jesus goal.

There have been a lot of comments after a goal was ruled out for an obstruction in the build-up to the Odsonne Edouard game, but this wasn't actually close, with a very clear gap between the lines.

Ben White was shown to be onside on Martin Odegaard's second goal, despite the fact that he was not in an obvious position. The attacking and defending lines made it clear that this was not a tolerance level.

Where are we going from here? The VAR will no longer have to decide the moment the ball has been played, plot players and draw the lines. Rather than relying on the regular TV broadcast frames, it will use custom cameras. The VAR will only be able to confirm that the ball is played by an attacking player or a player in an active position.

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An explainer of how the VAR will be used at the World Cup.

An improved version of goal-line technology or line calls in tennis, which take the fan directly in line with the players, is a 3D visualization. It's thought that it will remove the lack of trust among some fans.

The hope is that the new system will prove to be a success. The manual offside system that supporters dislike so much will no longer be used in the upcoming season.

The information was provided by the league.