Event: GP4 - December

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Opponent Rating Result
William H Luxton 1631 0 - 1
Oliver Balp 0 1 - 0
Howard L Tebbs 2023 0 - 1
Sharon Merchant 1492 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1087 = (5146 + 400 * (1 - 3)) / 4)

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