Event: Division 2

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Opponent Rating Result
Sam Kerruish 1464 1 - 0
David Welsh 1507 ½ - ½
Adrian Sanderson 1493 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1488 = (4464 + 400 * (1 - 1)) / 3)

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