Event: Division 2

Opponent Rating Result
Colin Weller 1620 ½ - ½
Thomas Rampling 1623 0 - 1
Jack Howorth 1577 0 - 1
John Foo 1505 ½ - ½
Ashley Carr 1500 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1325 = (7825 + 400 * (0 - 3)) / 5)

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