Event: Division 2

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Opponent	Rating	Result
Keith Baxter	1609	0 - 1
Richard J Johnson	1900	1 - 0
Alex Mckeigue	1832	½ - ½

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

1780 = (5341 + 400 * (1 - 1)) / 3)