Event: Division Two

Opponent Rating Result
Doruk Unver 1751 0 - 1
Peter W Leary 1744 0 - 1
Tim A Lane 1799 0 - 1
Roy A Lawrence 1811 0 - 1
Mike J Groombridge 1640 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1509 = (8745 + 400 * (1 - 4)) / 5)

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