Event: St Mary's Qualifier

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Opponent	Rating	Result
Otto Welz	0	½ - ½
Albert Pozarlik	1049	0 - 1
Edward Cottam	0	0 - 1

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

83 = (1049 + 400 * (0 - 2)) / 3)