Ancient Games

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@iQ0n

And another question i have: A 9 dan player of this ancient times, how good are they compared to todays 9 dan players?

The history and evolution of kyu rank in Go game

Well, sorry, but according to AI analysis of ancient games, they haven’t. There may be some advances in theory, but what really matters is strength in reading and positional judgement. If there is a difference, it is certainly not worth 6 stones. I think that most of even the top pros today doubt that they had a chance against the likes of Dosaku or Shuei.