Video assistant referees are at the Euros for the first-ever time, and ESPN is reviewing every full VAR review.
"UEFA believes very much in this project," said Roberto Rosetti, the chairman of UEFA's referees committee. "The aim is to not only to help referees, but to help football. We are very satisfied with the results, and we are working hard to improve the system."
There are 22 video match officials on duty at Euro 2020, all of them based centrally in a hub at UEFA's headquarters in Nyon, Switzerland. All 51 games will have a lead VAR, an assistant VAR and an offside VAR to make sure the game flows as well as possible.
Since UEFA started using VAR in February 2019, it has featured in 453 matches through to the 2021 Champions League final, with 139 decisions changed -- one in every 3.25 matches.
Each time VAR leads to a change of decision or pitchside monitor review, it will be detailed on this page as the tournament progresses.
Total VAR overturns: 6
Leading to goals: 1
Penalties awarded: 2 (1 missed)
Goals disallowed for offside: 3
Goals disallowed for handball: 1
6. GAME: Netherlands vs. Ukraine, June 17
DECISION: Penalty awarded for a foul by David Alaba (Austria), 8th minute.
WHAT HAPPENED: Denzel Dumfries was just inside the area when Alaba stood on his foot while trying to make a challenge. The referee didn't see the incident, but the VAR quickly advised a review for a penalty and Memphis Depay scored.
VAR RATING: 10/10 - It was a definite penalty and once again the review system worked perfectly. The referee needed no time at all to change his decision at the monitor and Memphis Depay scored from the spot.
5. GAME: Ukraine 2-1 North Macedonia, June 17
DECISION: Penalty awarded for handball against Daniel Avramovski (North Macedonia), 80th minute.
WHAT HAPPENED: Ukraine had a free kick on the right wing, which was played in by Ruslan Malinovskiy. Avramovski was in the wall and raised his arms when jumping, blocking the ball. Ruslan Malinovskiy saw his penalty saved by goalkeeper Stole Dimitrievski.
VAR RATING: 10/10 - Even though the handball law has been relaxed as of this tournament, Avramovski clearly raised his arm high and blocked the free kick. The referee had little option but to award the penalty when being asked by the VAR to review the incident on the pitchside monitor. It was the first time the monitor had been used at Euro 2020.
4. GAME: Italy 3-0 Switzerland, June 16
DECISION: Giorgio Chiellini (Italy) goal disallowed for handball, 19th minute.
WHAT HAPPENED: Chiellini went up to meet a corner, and after the ball ricocheted off a defender and his own body he fired in from close range. However, it was shown the ball had brushed his arm as it dropped to the ground and the VAR disallowed the goal.
VAR RATING: 10/10 - It was a quick and correct decision. The ball definitely hit the attacking player's arm before he scored, and intent is irrelevant. There has been a tweak to the attacking handball law for this tournament, in that only the goal scorer can be penalised for the offence. So if the ball had dropped to a teammate to score, the goal would have counted.
3. GAME: Finland 0-1 Russia, June 16
DECISION: Joel Pohjanpalo (Finland) goal disallowed for offside, 3rd minute.
WHAT HAPPENED: Joel Pohjanpalo thought he had given Finland an early lead with a flying header, but he was adjudged to be just offside from Jukka Raitala's cross. Finland went on to lose the game 1-0.
VAR RATING: 9/10 - UEFA was quicker to display the final offside image, but it still took 4 minutes to show Pohjanpalo was clearly offside.
2. GAME: France 1-0 Germany, June 15
DECISION: Kylian Mbappe (France) offside in the build-up to Karim Benzema goal, 85th minute.
WHAT HAPPENED: Paul Pogba played a through-ball to Mbappe, who unselfishly squared for Benzema to calmly sidefoot home. But a VAR review showed that Mbappe was in advance of the last defender and France had a second goal chalked off, but it didn't affect the result.
VAR RATING: 9/10 - A carbon copy of the disallowed Switzerland goal three days earlier. Mbappe was certainly offside, but the first VAR image broadcast by UEFA was unclear it wasn't until nine minutes after the "goal" was scored that viewers were shown the definitive evidence.
1. GAME: Wales 1-1 Switzerland, June 12
DECISION: Mario Gavranovic (Switzerland) goal disallowed for offside, 85th minute.
WHAT HAPPENED: Breel Embolo helped the ball on to Gavranovic inside the six-yard box, and he finished well past goalkeeper Danny Ward. The Swiss celebrated what they thought was a late winner, only for the VAR to rule it out for offside.
VAR RATING: 9/10 - Definitely the correct decision. Gavranovic was just ahead of the last defender when Embolo played the ball and VAR came to Wales' rescue. However, UEFA's lack of transparency in broadcasting the final VAR offside image loses it a point.