Event: Div 2 - Weston Trophy

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Opponent Rating Result
Peter J Hoare 1666 0 - 1
Robert Porter 1604 ½ - ½
Tom Hails 1690 1 - 0
P John Helliwell 1408 1 - 0
Qian Zheng 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1434 = (6368 + 400 * (3 - 1)) / 5)

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