Event: Div2

Opponent Rating Result
Roy Woods 148 1 - 0
David J Pickering 144 1 - 0
David Hulme 151 1 - 0
Esteve Mateu Guiu 179 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

356 = (622 + 400 * (3 - 1)) / 4)

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