Event: Division Four

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Opponent Rating Result
Kevin Day 121 1 - 0
Richard Woolley 109 1 - 0
Doreen Anderton 107 0 - 1
Martin J Draper 100 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

109 = (437 + 400 * (2 - 2)) / 4)

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