Event: Division 1

Opponent Rating Result
David Hulme 1864 ½ - ½
Adam Routledge 1825 0 - 1
David Hulme 1864 0 - 1
Steve Whatmore 1820 0 - 1
Philip Sykes 1562 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1627 = (8935 + 400 * (1 - 3)) / 5)

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