Event: Div3

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Opponent Rating Result
Roger W Walker 115 1 - 0
Edward Brown 107 0 - 1
Nigel D Marshall 114 0 - 1
J Martin Gibson 62 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-101 = (398 + 400 * (1 - 3)) / 4)

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