Just to add a few notes in addition to Pieter's answer, and with a hint to your implied question (can AlphaGo beat Lee Sedol?):
First off, I'm not sure if you thought being 9p automatically means being stronger than 2p. This is not the case.
However, in this particular instance, other matters are of more importance. Fan Hui has not been competing in Asian (...
Duplicate bridge certainly has full-time professional players who earn their living playing, although most of them are also teachers, and play with students for pay. There at least used to be professional players of Chemin de fer (a gambling game) and still are for blackjack and other casino gambling games.
There are a number of Magic: the Gathering players who derive all their income from the game, whether that be:
A direct contract from Wizards of the Coast, given to the players with the best competitive results
Prize money from winning tournaments
Writing about the game
Sponsorship related to all the above
The split ...
I believe your information comes from this unofficial rating system:
Fan Hui's page on that site:
Fan Hui only only played a few pro games - none recently - so his ranking there (or any other pro ranking system) is unreliable.
1P-9P rankings are not ratings (you only go up) and don't ...
I won't give a list since a list will keep changing. Rather, I'll give a method to find these games.
Go to https://www.twitch.tv/, which is the most popular platform used by streamers to stream themselves playing games. Go to the categories section, and sort all categories by viewer count. If we agree that the games most likely to have full-time professional ...
I will concentrate on the question 3 vs. a. While a move at a will also settle black's top left group, it helps the two white stones to make shape and build up pressure towards blacks top right corner. It also takes out other possibilities of attacking the two white stones like building a black wall towards the centre. On the other hand, 3 is a perfect move, ...
Is there any official and accessible world ranking ?
No; Rankings are done by national Go organizations, with some variance existing between them.
What is the exact rank of Fan Hui ?
As reported here,
Fan [Hui] earned a 2-dan professional ranking in China before emigrating to France, so it appears that go software has reached the level of ...