Event: Derby & District Division 2

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Opponent Rating Result
Yuriy Slobodyuk 1729 ½ - ½
Nigel D Marshall 1428 ½ - ½
Mike P Maher 1627 ½ - ½
George Gledhill 1537 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1680 = (6321 + 400 * (1 - 0)) / 4)

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