Event: Summer

Opponent Rating Result
David Edwards 0 0 - 1
Richard J Smith 0 0 - 1
Rick Dooley 0 0 - 1
Mark Paul 0 0 - 0
Peter J Worthington 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-400 = (0 + 400 * (0 - 4)) / 4)

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