Event: B Division

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Opponent Rating Result
Paul D Perrett 1811 0 - 1
Gordon Dickinson 1532 ½ - ½
Gary Leighton 1551 1 - 0
Michael J Creaney 1657 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1538 = (6551 + 400 * (1 - 2)) / 4)

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