Event: Division 2

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Opponent Rating Result
Julian H Summerfield 1864 1 - 0
Paul Rowan 1851 ½ - ½
Anthony Sadler 1834 0 - 1
Paul J Colburn 2006 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1789 = (7555 + 400 * (1 - 2)) / 4)

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