Event: John Davis 6200 League

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Opponent	Rating	Result
Craig Gradden	1673	0 - 1
Tom Plews	1547	1 - 0
Ben Lewis	1532	1 - 0
Andrei Tamboi	1577	0 - 1
Rob Old	1461	1 - 0

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

1638 = (7790 + 400 * (3 - 2)) / 5)