Event: Division 2

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Opponent Rating Result
Roger J Ditchburn 0 ½ - ½
Jonathan Lai 1882 0 - 1
Darren McCarthy 1692 1 - 0
Andrew Perella 1736 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1428 = (5310 + 400 * (2 - 1)) / 4)

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