Event: C Division

Opponent Rating Result
Graham W Matthews 1563 0 - 1
Luke Londesbrough 0 0 - 1
Keith Harrison 1555 0 - 1
Sam Ball 1438 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

839 = (4556 + 400 * (0 - 3)) / 4)

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