Event: Division 2

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Opponent Rating Result
Chris Haynes 140 1 - 0
Clifford M Oliver 106 1 - 0
Adrian Walker 143 ½ - ½
Ian P Blencowe 131 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

230 = (520 + 400 * (2 - 1)) / 4)

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