Event: Division 4

Opponent Rating Result
Stephen Rumsby 1598 0 - 1
Matthew Allen 1300 ½ - ½
Thomas Plummer 1200 0 - 1
Richard Buxton 1488 0 - 1
Mike J Johnson 1601 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1117 = (7187 + 400 * (0 - 4)) / 5)

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