Event: Division 2

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Opponent Rating Result
James Irwin 1785 0 - 1
Les J Jones 1722 0 - 1
Samuel Gaffney 1837 0 - 1
Robert L Jones 1704 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1362 = (7048 + 400 * (0 - 4)) / 4)

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