Event: Jim Barrington Trophy

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Opponent	Rating	Result
John Wassell	1292	0 - 1
Louis Maciel	950	0 - 1
David M Cotterell	1593	0 - 1

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

878 = (3835 + 400 * (0 - 3)) / 3)