Event: OTB Club Championship

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Opponent Rating Result
Joseph Rosenberg 1569 ½ - ½
David Smith 1644 0 - 1
A Fin O'Regan 1096 1 - 0
Laurence Duffy 1641 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1388 = (5950 + 400 * (1 - 2)) / 4)

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