Event: Division 1

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Opponent Rating Result
Simon Wilks 1930 0 - 1
Andrew P Lewis 2342 0 - 1
Jan Balogh 1975 ½ - ½
Ed Kirkham 1781 1 - 0
Andrew P Lewis 2327 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1911 = (10355 + 400 * (1 - 3)) / 5)

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