Event: Division 4

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Opponent Rating Result
Jos Dent 1222 1 - 0
Rohan Babu 1153 0 - 1
Francis Roe 1510 0 - 1
Paul Wileman 1450 0 - 1
Mark Turner 1316 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1090 = (6651 + 400 * (1 - 4)) / 5)

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