Event: SCCU County Championship: u1850

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Opponent	Rating	Result
V Ray Harper	1789	½ - ½
V Ray Harper	1789	0 - 1
Orla Dorman	1728	1 - 0

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

1769 = (5306 + 400 * (1 - 1)) / 3)