Event: Division 1

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Opponent Rating Result
Tim D Walker 2124 ½ - ½
Michael H Barnes 2172 ½ - ½
Jonathan A Tait 2175 0 - 1
Andrew P George 1951 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1906 = (8422 + 400 * (0 - 2)) / 4)

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