Event: Division 1

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Opponent Rating Result
Adrian N Walker 157 ½ - ½
Adam Batson 172 0 - 1
RN Phil Johnson 134 ½ - ½
Gerald Udell 109 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

143 = (572 + 400 * (1 - 1)) / 4)

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