Event: Division One

Opponent Rating Result
Jonathan Dale 161 ½ - ½
Cory S Hazlehurst 179 0 - 1
Tim A Lane 155 ½ - ½
Christopher J Bellin 143 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

60 = (638 + 400 * (0 - 1)) / 4)

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