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Re:Google reveals secret test of AI bot to beat top Go players by GolDDranks on Wednesday January 04, 2017 @04:32PM (#13322255)
There are multiple dan scales. The KGS scale is an amateur dan scale. I don't know how much the scales overlap generally, but I'd imagine a 9 pro-dan professional to be somewhere around 12 dan on amateur scale (pro scales also have more dense scaling). However, the scales reach the ceiling at 9 dan by convention.

Even the abbreviations differ: 9d (amateur dan) vs 9p (pro dan).

Re:Google reveals secret test of AI bot to beat top Go players by iopq on Wednesday January 04, 2017 @05:16PM (#13322623)
KGS 9 dan players are pros or amateurs that are professional level like former insei. The highest rank is almost 11d (it still says 9d, but the graph goes even higher):

https://www.gokgs.com/graphPage.jsp?user=leqi

Re:Google reveals secret test of AI bot to beat top Go players by nilkn on Wednesday January 04, 2017 @06:47PM (#13323278)
There's an Elo rating table on this Wikipedia page which pretty much corroborates/agrees with this:

https://en.wikipedia.org/wiki/Go_ranks_and_ratings