Event: Division 4

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Opponent Rating Result
Charlie Corden 1296 1 - 0
Huw Davies 1221 0 - 1
Stephanie Brown 1422 0 - 1
Penny A Wood 1458 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1149 = (5397 + 400 * (1 - 3)) / 4)

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