Event: Division A

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Opponent	Rating	Result
Paul O'Mara	140	0 - 1
Michael Farthing	129	½ - ½
David E Aspinall	140	0 - 1

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

-130 = (409 + 400 * (0 - 2)) / 3)