Event: Div2

Opponent Rating Result
Mike Allen 122 1 - 0
Brian Homewood 141 1 - 0
Ranjit Nath 151 1 - 0
Stephen G Wootton 138 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

538 = (552 + 400 * (4 - 0)) / 4)

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