Event: Guildford

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Opponent Rating Result
Ernest Robinson 1248 0 - 1
Zeno Ling-Winston 0 1 - 0
Teddy Thomassen 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

549 = (1248 + 400 * (2 - 1)) / 3)

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