Event: GP2 - October

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Opponent Rating Result
Mark Sheehan 0 0 - 1
Harry Morter 1291 ½ - ½
Sharon Merchant 1373 ½ - ½
Mick Sullivan 646 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

828 = (3310 + 400 * (1 - 1)) / 4)

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