Event: Dave Welch 7200 League

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Opponent	Rating	Result
Sanjoy K Banerjee	1733	1 - 0
Mike J O'Mahony	1782	½ - ½

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

1958 = (3515 + 400 * (1 - 0)) / 2)