Great New Video from 3Blue1Brown on the IMO 2011 Problem 2

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It is a nice video.
jedishrfu said:
The Intl Math Olympics of 2011 had a problem that stumped many young participants except one who received a perfect score:
Several participants received a perfect score in that problem (the video has the number somewhere, 26 or so). Only one received a perfect score in all six problems.
26 is still a very low number, especially for problem 2 (which is usually easier than problems 3 and 6).
 
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Instructive video for teachers and students on problem solving. Data from human factors study, called social in the video, might help resolve the difficulty level comparison issue.

How many or which participants were coached or prepared with a similar problem?