Event: Watkinson League

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Opponent Rating Result
Ben Emmerson 109 1 - 0
David Keddie 169 0 - 1
J Myers 112 0 - 1
Granville Boot 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-103 = (390 + 400 * (1 - 3)) / 4)

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