Event: Gordon Nobbs League

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Opponent Rating Result
Geoffrey Banks 111 1 - 0
Paul Green 74 1 - 0
Paul Green 74 1 - 0
Anthony Tatam 94 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

488 = (353 + 400 * (4 - 0)) / 4)

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