Event: Club Championship

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Opponent	Rating	Result
James Allsopp	1662	1 - 0
Alex P Nicholls	1438	1 - 0
Brian Turner	1951	½ - ½

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

1950 = (5051 + 400 * (2 - 0)) / 3)