Event: Division 4

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Opponent Rating Result
Roger Hardy 1775 0 - 1
Jack Giltrap 1381 1 - 0
Kevin D Langmaid 1556 0 - 1
Harry Duckworth 1526 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1360 = (6238 + 400 * (1 - 3)) / 4)

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