Event: Open

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Opponent	Rating	Result
Mark A Talbot	2029	0 - 1
Kevin Ye	1723	1 - 0
Kieran O'Driscoll	0	½ - ½

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

1251 = (3752 + 400 * (1 - 1)) / 3)