Event: Mamhead

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Opponent Rating Result
Paul Brooks 160 ½ - ½
Steve Clarke 143 1 - 0
Brian GE Gosling 158 ½ - ½
David J Archer 156 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

154 = (617 + 400 * (1 - 1)) / 4)

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