Event: Open

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Opponent Rating Result
Golam S Ali 164 0 - 1
Derek A Stockhall 114 1 - 0
John Mildenhall 165 0 - 1
Derek A Stockhall 114 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

139 = (557 + 400 * (2 - 2)) / 4)

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