Event: Watkinsons League

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Opponent Rating Result
Robert Oldfield 1551 1 - 0
Michael Holmes 0 1 - 0
Mohammed Rohman 1580 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1177 = (3131 + 400 * (2 - 1)) / 3)

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