Event: Open-Rapid-play

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Opponent Rating Result
Athar Ansari 2117 0 - 1
Patrick CM Duncan 2116 ½ - ½
Patrick CM Duncan 2116 ½ - ½
Athar Ansari 2117 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2117 = (8466 + 400 * (1 - 1)) / 4)

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