Event: MH Brown Summer League Section 1

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Opponent Rating Result
John Thackray 1921 ½ - ½
Mark I Collinson 1961 0 - 1
Douglas Vleeshhouwer 2018 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1967 = (5900 + 400 * (1 - 1)) / 3)

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