Event: Stowmarket Club Championships

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Opponent Rating Result
Derek Chamberlain 0 0 - 1
William Mackintosh 0 1 - 0
Ray Firman 0 1 - 0
James Irwin 0 0 - 1
Stephen Lewis 1800 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

280 = (1800 + 400 * (2 - 3)) / 5)

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