Event: Division 2

Opponent Rating Result
Aidan T Corish 1780 0 - 1
Mike J Cresswell 1688 ½ - ½
Philip Staniland 1851 0 - 1
Christopher Wray 1356 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1569 = (6675 + 400 * (1 - 2)) / 4)

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