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For OFB, the Swiss system is excellent. It's the best system for weeding out players (rather than determining winners) from a group of ten. Moreover, you can still compete calmly after two losses. And if you're lucky, even after three. The fact that people withdraw from the competition themselves further reduces the randomness of the final result. However, for some reason, in the last OFB, there weren't the usual two extra rounds. And now, a cause-and-effect relationship has emerged.