Event: Division 1

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Opponent Rating Result
Gavin James Hughes 1960 ½ - ½
Oliver Froom 2008 ½ - ½
Steven Mitchell 1825 ½ - ½
Adrian Billingsley 1762 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1989 = (7555 + 400 * (1 - 0)) / 4)

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