Event: Div1

Opponent Rating Result
David Williams 159 ½ - ½
Janos J Wagenbach 138 ½ - ½
Andrew J Mort 158 ½ - ½
Steven J Burke 172 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

157 = (627 + 400 * (0 - 0)) / 4)

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