Event: Christmas rapidplay

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Opponent Rating Result
Rishabh Sidana 1753 0 - 1
Ishaan Chadha 1229 0 - 1
Lawrence Waller 330 1 - 0
Prem C Shah 1108 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1005 = (4420 + 400 * (1 - 2)) / 4)

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