Event: Atkinson Cup

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Opponent Rating Result
Colin W Field 1468 0 - 1
Stephen Garner 1399 ½ - ½
David Atkin 1367 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1411 = (4234 + 400 * (1 - 1)) / 3)

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