Event: Division 2

Opponent Rating Result
David Hulme 1822 0 - 1
John Staniforth 1827 0 - 1
Steve Whatmore 1830 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1560 = (5479 + 400 * (0 - 2)) / 3)

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