Event: Division 4

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Opponent Rating Result
Julian P Cook 90 1 - 0
David A Hallen 92 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

291 = (182 + 400 * (1 - 0)) / 2)

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Opponent Rating Result
Andrew Mowat 117 0 - 1
Harry Gardiner 104 0 - 1
James Marshall 101 1 - 0
Derek Whitehurst 101 ½ - ½
Harry Gardiner 104 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

25 = (527 + 400 * (1 - 2)) / 5)