Event: Durham League Division B

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Opponent	Rating	Result
Robert Donner	1642	½ - ½
David Lowcock	1440	1 - 0
Graham W Matthews	1580	½ - ½

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

1687 = (4662 + 400 * (1 - 0)) / 3)