Event: Division 4

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Opponent Rating Result
Brian Jones 1099 0 - 1
Aditya Singh Kathait 1050 1 - 0
Stuart Andrews 1190 0 - 1
Jimmy Allen 1050 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

897 = (4389 + 400 * (1 - 3)) / 4)

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