Event: Summer League

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Opponent Rating Result
Dominic Chapman 1601 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2001 = (1601 + 400 * (1 - 0)) / 1)

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Opponent Rating Result
Ken McGuinness 0 1 - 0
Dominic Chapman 1601 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

801 = (1601 + 400 * (1 - 1)) / 2)