Event: Bolton Qualifier

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Opponent	Rating	Result
David Reeves	0	1 - 0
Sam Stacey	0	1 - 0
Rohit Surapaneni	1606	0 - 1

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

669 = (1606 + 400 * (2 - 1)) / 3)