Event: Division 4

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Opponent Rating Result
John Bickley 1257 1 - 0
Lee Conyard 1566 0 - 1
Rafferty Stather 1484 ½ - ½
Scott Westaway 1251 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1490 = (5558 + 400 * (2 - 1)) / 4)

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