Event: John Davis 6200 League

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Opponent	Rating	Result
Kelly Quirk	1335	1 - 0
Daniel Westhead	1364	½ - ½
Nicola Lord	1587	1 - 0

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

1695 = (4286 + 400 * (2 - 0)) / 3)