Event: Woodhouse Cup

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Opponent	Rating	Result
John Thackray	1976	½ - ½
Andrew B Mata	1876	0 - 1
Simon D Arnold	1932	0 - 1

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

1661 = (5784 + 400 * (0 - 2)) / 3)