Event: St Mary's Qualifier

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Opponent	Rating	Result
Joe Leyland	0	1 - 0
Alistair Craggs	1317	0 - 1
Mo Chen	0	0 - 1

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

306 = (1317 + 400 * (1 - 2)) / 3)