Event: A Division

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Opponent Rating Result
Bill Wilson 1855 ½ - ½
Stephen Cole 1849 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1852 = (3704 + 400 * (0 - 0)) / 2)

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Opponent Rating Result
Alexandros Kalyviotis 1577 ½ - ½
Jonathan Sams 1829 0 - 1
Michael J Creaney 1657 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1554 = (5063 + 400 * (0 - 1)) / 3)