Event: Durham League Division B

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Opponent	Rating	Result
Jack Lally	0	½ - ½
Vaughan Davison	1585	0 - 1
Stephen Carter	1572	1 - 0

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

1052 = (3157 + 400 * (1 - 1)) / 3)