Event: Stowmarket Club Championships

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Opponent Rating Result
Richard Caves 1050 1 - 0
Ray Firman 0 1 - 0
Derek Chamberlain 0 1 - 0
William Mackintosh 0 1 - 0
Stephen Lewis 1800 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

890 = (2850 + 400 * (4 - 0)) / 5)

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