Event: Division 2

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Opponent Rating Result
David J Barker 1481 ½ - ½
John A Dugmore 1319 0 - 1
Stephen Gaskell 1275 1 - 0
Sam Duffield 1210 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1221 = (5285 + 400 * (1 - 2)) / 4)

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