Event: Division 3

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Opponent	Rating	Result
Tom Trevena	1308	1 - 0
David J Stuart	1363	1 - 0
David I Buckley	1257	½ - ½

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

1576 = (3928 + 400 * (2 - 0)) / 3)