Event: Division A

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Opponent Rating Result
Martin Lythgoe 164 ½ - ½
William O'Rourke 156 ½ - ½
James Carrington 159 1 - 0
Mark A Whitehead 167 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

162 = (646 + 400 * (1 - 1)) / 4)

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