Event: Durham League Division B

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Opponent	Rating	Result
Graham R Marshall	1415	1 - 0
Michael Smalley	0	½ - ½
John Reddington	1548	½ - ½

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

1121 = (2963 + 400 * (1 - 0)) / 3)