Even Yoda Norimoto, 9p can lose to amateur!
Black: Seo Bugil, 7-dan amateur (Korea) White: Yoda Norimoto, 9p (Japan)
Yoda, 9p is much stronger, of course, but even if the difference is big, it's hard to win all of your games.
We can also remember Yoda's 0.5 point loss to Hans Pietch, 1p in important international tournament about 10 years ago
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