Event: Division Four

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Opponent Rating Result
John Davis 117 0 - 1
Eric Horwill 134 0 - 1
Stan Grayland 122 0 - 1
Peter Hodkinson 105 1 - 0
Pauline Woodward 92 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

34 = (570 + 400 * (2 - 3)) / 5)

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