Event: Division 2

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Opponent Rating Result
Leon Horsfall 1509 0 - 1
Donna Chadwick 1295 1 - 0
Leon Horsfall 1509 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1304 = (4313 + 400 * (1 - 2)) / 3)

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