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Users don't have the read the search quality guidelines first, they only need to visit the 2 pages and tell Google which one they prefer. There are 4 choices: the first result, the second result, both results are equally good, neither result is good enough.
One of the 2 results was the Amazon page for a book and it already had a high ranking. The second result was the book's homepage, which had a lower ranking, but was placed above the Amazon result for this experiment. Google probably wanted to check if the Amazon result was indeed better.
{ Thanks, Marcus. }
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