Event: Club Knockout

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Opponent	Rating	Result
David Jarvis	1475	½ - ½
David Jarvis	1475	1 - 0
Stephen Gaskell	1975	0 - 1

performance = (sum(opponents ratings) + 400(wins-losses)) / games

1642 = (4925 + 400 * (1 - 1)) / 3)