Event: Summer League Division 1

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Opponent Rating Result
D Martin Howard 1978 0 - 1
Andrew Birtwhistle 1736 ½ - ½
Will Winlow 1686 1 - 0
David Ashcroft 1787 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1697 = (7187 + 400 * (1 - 2)) / 4)

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