Event: Club Championship

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Opponent Rating Result
Ray Garside 1540 1 - 0
J Dave H Hair 1727 1 - 0
Chris M Smith 1707 0 - 1
Keith D Marshall 1753 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1682 = (6727 + 400 * (2 - 2)) / 4)

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