Event: Div 4 - Athenaeum Cup

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Opponent Rating Result
Sarah L White 1525 ½ - ½
Peter Portius 1602 0 - 1
Ian Barker 1548 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1558 = (4675 + 400 * (1 - 1)) / 3)

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