Event: Division 2

Opponent Rating Result
Jon AN Lawrance 159 0 - 1
Michael Cain 139 0 - 1
Julian B Mitchell 148 ½ - ½
Chris Lake 157 ½ - ½
Michael Stockham 137 1 - 0
W John Marshall 145 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

81 = (885 + 400 * (1 - 2)) / 6)

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