Event: Division One

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Opponent Rating Result
Philip Purcell 181 0 - 1
John Staniforth 161 ½ - ½
Raymond Carpenter 162 0 - 1
Richard W Smith 172 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-31 = (676 + 400 * (0 - 2)) / 4)

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