Video assistant referee
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The assistant video assistant referee (AVAR) is a current or former referee appointed to assist the VAR in the video operation room. The responsibilities of the AVAR include watching the live action on the field while the VAR is undertaking a "check" or a "review", to keep a record of reviewable incidents, and to communicate the outcome of a review to broadcasters.
Following extensive trialling in a number of major competitions, VAR was formally written into the Laws of the Game by the International Football Association Board (IFAB) on March 3, 2018. Operating under the philosophy of "minimal interference, maximum benefit", the VAR system seeks to provide a way for "clear and obvious errors" and "serious missed incidents" to be corrected.