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

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The 2011 International Math Olympiad featured a challenging problem known as the Windmill problem, which only a few participants solved perfectly, with 26 achieving a perfect score on that specific problem. However, only one contestant managed to score perfectly across all six problems. This highlights the relative difficulty of problem 2, which is typically easier than others in the competition. The accompanying video serves as an instructive resource for both teachers and students, emphasizing problem-solving strategies. Additionally, there is curiosity about the coaching backgrounds of participants and whether any were specifically prepared for similar problems.
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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?
 
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