Rank - amateur and professional

    Keywords: Culture & History

Professional dan

Japanese professional ranks go from 1 dan to 9 dan, with 9 dan being strongest. In theory, by virtue of their superior training and rigorous discipline, professional players are always stronger than amateurs. In practice, a few ultra-strong amateurs 7 dans have occasionally beaten a few of the weaker professional 1 dans in even games. (That's what I heard from the folks who taught me the game; I have since learned that strong amateurs can sometimes beat strong pros.)


BillSpight: I read years ago (something by Sakata) that top amateurs could match pro 5th or 6th dans. Recently I have read claims such as the one above. Not that it matters, but I doubt it. :-)

TakeNGive: Particularly in light of the 2001 San Francisco Oza results, I have to say that very strong amateurs are as strong as professionals.


The steps between pro ranks are said to be smaller than between amateur ranks -- about 1/3 of a stone.


BillSpight: The traditional pro handicapping made a difference of three ranks per stone. However, with the new (post-WWII) pro rankings, there seems to be a two-stone difference between 9-dans and shodans, which translates to about 1/4 stone per rank.


exswoo: So, if one were to convert the pro ratings back to amateur ratings, a 9p would be more or less a 10d amateur? That's interesting..., and since the oft-repeated saying is that a grandmaster would need a 3-stone handicap to play against God, God must be 22p :)

OneWeirdDude: I wouldn't put God on the pro scale anymore than I would put an amateur there and say he's a negative 50 pro dan. The scale only goes up to 9p, so I'd just say He's a 13d, rather than put Him on a pro scale. But that's just me not knowing 100% of what I'm talking about at the same time.


Andre Engels: In Europe, a 7D European rank is considered about equivalent in strength to a 1-2P professional.


BlueWyvern: From a conversation I had with a top European amateur, currently new Japanese pro's have the strength about of a 5 dan pro. Apparently the new crop has been getting tougher lately, so for someone of 1 dan strength, you need to take a pro who has been 1 dan for 10 or more years.


Calvin: Some data from the Pro-Am Honinbo Match might be interesting, although I can't find it compiled anywhere. Usually white gives komi and handicap. Here's a link where Iwai Ryuichi won against O Meien playing black with 2 stones and -5 komi. The result was B+4, so that's a two-stone game:

[ext] http://www.msoworld.com/mindzine/news/orient/go/sgf/honproam38.sgf

Harada Minoru, a very strong Japanese amateur, took three stones and -2.5 komi against Cho Chikun in the 1997 Pro-Am Honinbo and lost.

Bob McGuigan: It's interesting to see some of Harada's other results: 1963 and 64 defeated Sakata with 2 stones, 1968 defeated Rin with 3.5 reverse komi, 1979 jigo with Cho Chikun with 5 point reverse komi. The results of all these matches are in the Japanese yearbooks.

Dave: The komi system used is explained on Amateur Honinbo vs Pro Honinbo 2002.

Sampi: Pros are just people who decided to make a career in go. An amateur can be as strong as a 9p, he just didn't pick up go professionally. Usually very strong amateurs become pros but thats not always the case.


A friend tells a story he got from his Japanese teacher. Not sure if the teacher saw it or just heard about it.

Japanese Go club, full of strong amateurs and several pros. Anyone under 5 dan is there for lessons. One regular is a well-known 9-dan pro. Everyone knows everyone else here, and most of the other strong players around.

One day, someone nobody recognises walks in, immediately sits down with the 9-dan, takes two stones, and loses by a narrow margin. Observers are amazed.

After he leaves, someone gets up the courage to ask "Sensei, who the devil was that?" "My elder brother. I learned Go from him and did not win a game against him until I was 18, but I turned pro and he went into business."



This is a copy of the living page "Rank - amateur and professional" at Sensei's Library.
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