Event: Derby & District Division 2

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Opponent Rating Result
Roger Moors 1510 1 - 0
Brian Crofts 1580 ½ - ½
Norman J Davies 1625 0 - 1
Matthew Caswell 1642 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1689 = (6357 + 400 * (2 - 1)) / 4)

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