Event: Mamhead

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Opponent Rating Result
Alan J Dean 144 1 - 0
Ken Ashby 99 1 - 0
John CH Nyman 146 0 - 1
Michael J Dow 105 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

124 = (494 + 400 * (2 - 2)) / 4)

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