Event: Mini League

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Opponent Rating Result
Simon Watson 1866 0 - 1
Lewis Carroll 1374 1 - 0
Andy Ross 1705 0 - 1
Stephen Forbes 1492 0 - 1
Pete Brennan 1539 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1515 = (7976 + 400 * (2 - 3)) / 5)

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