Event: Open Rapid-play

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Opponent Rating Result
Chris Chadwick 1998 1 - 0
Steve F Tarr 1797 1 - 0
Chris Chadwick 1998 0 - 1
Steve F Tarr 1797 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2098 = (7590 + 400 * (3 - 1)) / 4)

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