Event: Division 5

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Opponent Rating Result
Michael J Lord 1600 1 - 0
Jonathan Welton 1696 0 - 1
Edward Hargreaves 1651 ½ - ½
Simon C Sellick 1570 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1529 = (6517 + 400 * (1 - 2)) / 4)

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