Event: A Division

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Opponent Rating Result
Austin C Elliott 1918 ½ - ½
Kyle Pelling 2033 0 - 1
Gareth NR Griffiths 1733 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1895 = (5684 + 400 * (1 - 1)) / 3)

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