Event: Division 2

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Opponent Rating Result
Ian Goodyer 1564 1 - 0
Robert W Counsell 1706 0 - 1
Colin D Clark 1600 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1490 = (4870 + 400 * (1 - 2)) / 3)

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