Why did VAR allow Japan’s second goal against Spain in the World Cup?

Surprisingly, the Japan beat Spain 2-1 in the last round of the group stage gives Qatar World Cup🇧🇷 However, the second Japanese goal, scored by tanaka, continues to raise doubts as to its legality. The turnaround goal was only confirmed after analysis by VAR, who checked whether the ball had left the field, after being canceled on the field. Finally, it was validated and the Japanese team confirmed the triumph and the first place in the Group Eeliminating the Germany.

Five minutes into the second half, Mitoma was launched on the bottom line and stretched to cross the ball back. Tanaka finished and scored the goal. However, on the field, the referee of the match, the South African Victor Gomes, annulled the goal, stating that the ball had left the field by the bottom line before Mitoma performed the pass. After checking, VAR corrected the judge’s decision and validated the goal.

The bid generated a lot of controversy with opinions diverging as to the validity of the goal. According to the rule, the ball needs to completely cross the bottom line to be out of play. The controversy was precisely the way used to infer whether or not there was part of the circumference of the ball in a direction perpendicular to the bottom line. Even with the Al Rihla being equipped with sensors and a chip🇧🇷 able to detect if it has crossed the goal line and to determine the moment when it starts moving after a pass, contributing to the semi-automatic offside technology implemented by Fifa in this Cup, they are unable to provide the position of the ball in relation to the lines sides and bottom. That’s when VAR came into play.

The validation of Japan's second goal, by Tanaka, generated controversy when it was validated by VAR.
The validation of Japan’s second goal, by Tanaka, generated controversy when it was validated by VAR. Photograph: Peter Cziborra/Reuters REUTERS

The video refereeing team had to perform a visual analysis to determine whether the ball had crossed the end line or not. After checking different angles and drawing the respective parameter lines, the VAR team guided the validation of the goal. However, the impression that the ball was out of bounds can be explained by a phenomenon called parallax, which is very common in areas such as physics and astronomy, and which also appears in football. This same concept is used to draw the VAR lines in the offside check, taking into account that semi-automatic technology is not yet available in all leagues in the world.

The concept of parallax is defined by the apparent change in location of an object as observed by those positioned at different locations. This phenomenon explains why, in many cases, the camera angle presented to viewers in a TV broadcast is not always ideal for reaching a conclusion in a bid.

On many occasions, there is an impression from the broadcast images that a player is in a legal position, for example, even if the lines drawn by the VAR point to an irregular position, or vice versa. Currently, impediments are analyzed as follows: the company responsible for generating the images used in the transmission recovers the bid in question and forms the lines that will be drawn by the video referee in the “portrait” of the play. The person responsible for the VAR booth then indicates the reference points that will be used for the tracing, such as the right foot of a defender and the torso of the goal scorer, indicating the irregularity through the concept of parallax.

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