Event: Division 2

Opponent Rating Result
Andreas Stalidis 0 0 - 1
James Meadows 0 0 - 1
Ian G Sandford 1899 0 - 1
Geoffrey Gammon 1492 1 - 0
David Wilson 1328 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

864 = (4719 + 400 * (2 - 3)) / 5)

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