Event: John Davis 6200 League

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Opponent	Rating	Result
Keeghan McGarry	1526	0 - 1
Chris Burr	1312	1 - 0
Paul Sutton	1363	0 - 1

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

1267 = (4201 + 400 * (1 - 2)) / 3)