Event: Division 2

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Opponent	Rating	Result
Jim Stevenson	0	½ - ½
Thomas Ewart	0	1 - 0
Shehab Alshehabi	0	1 - 0

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

267 = (0 + 400 * (2 - 0)) / 3)