Event: Division 1

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Opponent Rating Result
Simon Weber 0 1 - 0
Simon Chester 142 ½ - ½
Herbert Lockwood 133 ½ - ½
M John Cawston 155 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

108 = (430 + 400 * (1 - 1)) / 4)

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