Event: Open Rapid-play

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Opponent Rating Result
Matthew McLachlan 1961 ½ - ½
David R Thomas 1830 0 - 1
Matthew McLachlan 1961 0 - 1
David R Thomas 1830 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1796 = (7582 + 400 * (1 - 2)) / 4)

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