Event: Division One

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Opponent Rating Result
Tanmay Chopra 0 1 - 0
Tanmay Chopra 0 ½ - ½
David C Okike 201 1 - 0
Richard Black 188 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

397 = (389 + 400 * (3 - 0)) / 4)

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