Event: John Davis 6200 League

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Opponent	Rating	Result
Iain Smith	1567	½ - ½
Tom Plews	1547	0 - 1
Bryan E Simm	1300	1 - 0

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

1471 = (4414 + 400 * (1 - 1)) / 3)