Event: Division 3

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Opponent Rating Result
Keith Milner 1336 0 - 1
Tom Trevena 1308 0 - 1
David J Stuart 1363 0 - 1
Ian Boddington 1331 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1135 = (5338 + 400 * (1 - 3)) / 4)

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