Event: Division 2

Opponent Rating Result
Mark S Gray 2208 ½ - ½
Wingki Kwong 2202 0 - 1
Tony B Packham 1817 1 - 0
Martin G Smith 1905 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1933 = (8132 + 400 * (1 - 2)) / 4)

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