Event: Walker Shield

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Opponent Rating Result
Kenneth Keeler 91 0 - 1
Robert Twigg 80 1 - 0
Michael Doyle 87 0 - 1
Kenneth Keeler 91 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

87 = (349 + 400 * (2 - 2)) / 4)

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