Event: A Division

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Opponent Rating Result
Adam Scoular 1905 1 - 0
John L Bentley 2156 ½ - ½
David Burgess 2050 1 - 0
John L Bentley 2156 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2167 = (8267 + 400 * (2 - 1)) / 4)

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