Event: Div1

Opponent Rating Result
Esteve Mateu Guiu 184 ½ - ½
Derek A Jarvis 178 ½ - ½
David Williams 159 1 - 0
Ranjit Nath 155 ½ - ½
Michael D Johnson 169 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

249 = (845 + 400 * (1 - 0)) / 5)

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