Event: Division 2

Opponent Rating Result
Kevin Argyle 1548 1 - 0
Richard Chillcott 1744 0 - 1
John Hart 1705 0 - 1
Joshua Pimm 1489 ½ - ½
David Griffiths 1559 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1449 = (8045 + 400 * (1 - 3)) / 5)

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