Event: Division 2

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Opponent Rating Result
Samuel Gaffney 1837 0 - 1
Robert W Stephens 1734 0 - 1
James Irwin 1815 0 - 1
Les J Jones 1734 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1480 = (7120 + 400 * (0 - 3)) / 4)

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