Event: Division 4

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Opponent Rating Result
Rob Jarvis 1603 0 - 1
Graham Johnson 1563 1 - 0
Andy While 1523 ½ - ½
Richard Dyce 1502 1 - 0
Ben Eyres 1136 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1625 = (7327 + 400 * (3 - 1)) / 5)

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