Event: Division 4

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Opponent Rating Result
Andrew Powell 1507 ½ - ½
Matthew Allen 1620 1 - 0
Huw Davies 1208 0 - 1
Stephen Gill 1197 0 - 1
Adrian Grimes 1399 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1226 = (6931 + 400 * (1 - 3)) / 5)

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