The 3-3 joseki is not considered even. It is supposed to be played in circumstances where thickness is inefficient, or an invasion/normal approach is attractive.
Conventional theory is to play the approach move from the right hand, extending the top right formation.
Note; something Michael Redmond mentioned in the commentary which is false is that joseki is even. Its not correct: josekis are not even, but are the best recognized patterns given a specific purpose.
In a way, straying from joseki means that you failed to apply the best possible sequence for the pattern you wanted to play. There is some subtlety around this topic.
Whether a joseki is even or not depends on the context. However, when a joseki is played, it is considered to produce an even result by both players in that specific situation; otherwise, trivially, they would not play that way. The latter was precisely Redmond's point.
> Whether a joseki is even or not depends on the context
The whole point of joseki is its locality. Josekis do not depend on context to be joseki: it could be a bad joseki choice, but what they are, they are locally.
When you deviate from joseki you are; a) creating a new joseki b) recognizing that joseki is not applicable in the context, and its better to take a local loss to get a global gain.
Josekis are filled with non-even results, but that given
a tactical goal, they are the best choice possible.
I haven't studied AlphaGo games against Lee Sedol. I wonder if Ke Jie played that way because he saw AlphaGo playing a good counter to the more usual moves (an approach on the right side).
Conventional theory is to play the approach move from the right hand, extending the top right formation.
Note; something Michael Redmond mentioned in the commentary which is false is that joseki is even. Its not correct: josekis are not even, but are the best recognized patterns given a specific purpose.
In a way, straying from joseki means that you failed to apply the best possible sequence for the pattern you wanted to play. There is some subtlety around this topic.