Event: Clough (Handicap)

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Opponent	Rating	Result
Stephen Burton	1519	1 - 0
William Boothman	1747	½ - ½
Andrew Walker	1444	1 - 0

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

1837 = (4710 + 400 * (2 - 0)) / 3)