Event: Rated club games

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Opponent Rating Result
Wieslaw Stanicki 1485 1 - 0
Christopher Lamming 1768 0 - 1
Roy A Ludlow 1558 1 - 0
Roy A Ludlow 1550 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1690 = (6361 + 400 * (2 - 1)) / 4)

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