Event: Online Division 2

Opponent Rating Result
Mark A Keady 1887 1 - 0
Andrew T Jones 1407 1 - 0
Stephen Tulett 1438 0 - 1
Stephen Tulett 1439 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1643 = (6171 + 400 * (2 - 1)) / 4)

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