Event: The Friendly League

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Opponent Rating Result
Andrew Thornley 1457 1 - 0
Anthony Jinks 1539 1 - 0
Ronnie Sutton 935 1 - 0
William T Jones 880 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1603 = (4811 + 400 * (4 - 0)) / 4)

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