Event: Derby & District Division 2

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Opponent Rating Result
Richard Anderson 1889 0 - 1
Brian Crofts 1572 0 - 1
Kevin J Gallagher 1655 ½ - ½
Roger Moors 1503 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1555 = (6619 + 400 * (1 - 2)) / 4)

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