What is a teacher good for? I'd say that the teacher is not there to teach fine details, but to tell the student ideas that the student will have to pay attention to when reading books or reviewing games, as in the quote below:

I think the role of a teacher varies greatly depending on the student. A random 6 year old, a random adult and a random academic are not the same.

I think there are more academics active on L19 than 6 year olds. And many of them have played and studied go for decades. Our memories of our own path in go are not really representative for an average group of beginners.

If it's not too late to add to the discussion of the specific 3-3 pattern, I have some analysis of what katago thinks is the best move in a range of cases:

At this point:

Click Here To Show Diagram Code

[go]$$
$$ ----------------------
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . 1 3 . . . . . . .
$$ | . . . 2 a b . . . , .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .[/go]

Across a sample of 100 mid-to-high-dan KGS games (post AI era), the bot chooses the extension at a 73% of the time and the jump to b 27% of the time (ignoring a couple of cases where katago wanted to tenuki.)
Personally I thought I'd seen the bot choose the jump more often, but this seems consistent with the thread.

At this point:

Click Here To Show Diagram Code

[go]$$
$$ ----------------------
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . 1 3 b d . . . . .
$$ | . . a 2 4 . . . . , .
$$ | . c . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .[/go]

Across a sample of 200 mid-to-high-dan KGS games (post AI era), the bot chooses the turn at a 48% of the time, pushing again at b 41% of the time(!), the knights move c 11% of the time and on 2 occasions jumped to d (5 positions where katago wanted to tenuki.)
I'm surprised to see that pushing again is more common than the knights move. This seems like a strategy to take sente to me. The sort of thing that humans still find difficult to accept maybe?

At this point:

Click Here To Show Diagram Code

[go]$$
$$ ----------------------
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . 1 3 a . . . . . .
$$ | . . . 2 4 . . . . , .
$$ | . 5 . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .[/go]

Across a sample of 50 mid-to-high-dan KGS games (post AI era), the bot actually played away for 20 of the board positions.
When the bot chose to play locally it played at a 87% of the time with the remaining few board positions each having unique jumps and centre moves as the bot choice.

At this point:

Click Here To Show Diagram Code

[go]$$
$$ ----------------------
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . 1 3 6 . . . . . .
$$ | . . . 2 4 . . . . , .
$$ | . 5 . . . . . . . . .
$$ | . . b a . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .[/go]

Across a sample of 50 mid-to-high-dan KGS games (post AI era), the bot chooses the knights move at a 57% of the time, kosumi at b 17% of the time, there were only a handful of board positions where katago chose a pincer on the top side.
From the Waltheri search mentioned below I think this seems pretty consistent with the human choices

Alternatively, at this point:

Click Here To Show Diagram Code

[go]$$
$$ ----------------------
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . 1 3 b . . . . . .
$$ | . . 5 2 4 . . . . , .
$$ | . . z . . . . . . . .
$$ | . . . a . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .[/go]

Across a sample of 100 mid-to-high-dan KGS games (post AI era), the bot chooses the old human-move jump at a 89% of the time, and bending round at b 9% of the time(ignoring a few tenuikis.) I really thought I'd seen the block at z come up when reviewing but it didn't come up as top choice in my sample of games at all.
I thought of b as a small mistake previously as black following up around d15 feels too good so I'm surprised to see it as top choice on some board positions.

If anyone is interested I can provide the whole board positions where katago makes each choice.

I'm fairly sure that any of these choices would loose only a fraction of a point in the case that it's not kg's top choice and if played by a beginner, should be described as an excelent choice on almost any board position. I wouldn't want a beginner anyone to think that there is one true way and all others are inferior, but I think looking at examples of good play can be a good platform for discussions.

I understand you can read into my opinion this way but that's not at all what I was saying.

Let me rephrase your differentiation of knowledge:

- things you know for sure
- things you know about

I'm not advocating limiting teaching to things you know for sure. Exposure to topics can be driven by many factors, the most important of which is what seems to tickle the pupil/novice.

In general I don't like "things you know about" to be presented as "things you know".

Yes, you explain/show a 3 point nakade before a 5 point nakade before the L-group. Yes, you show simple corner patterns before showing variations of 30 moves, traditional or old.

No, you don't show traditional 4-4 joseki while hiding modern joseki because of the idea that the old stuff is somehow more true. No you don't teach "cross cut, then extend" if the data doesn't support it.



There's so much to talk about in Go that I don't see why I should narrow that to something I am comfortable with, even though today's insights tell me it's doubtful. Why would I do that?



Most of all, the student's interest, desire and motivation.



Of course, the things they still don't know. I don't blame any pro for teaching what they genuinely believe is the correct thing to show. I doubt if pros deliberately teach lines of play they know are inferior or not true.




Well I don't want to obsess about it. Let anyone do as they please. I'm mostly advocating modesty when teaching.



Agreed!

I'm not sure if you know, but z can be a bad exchange / trick move / overplay that may be refuted by clamping:

Click Here To Show Diagram Code

[go]$$W
$$ ----------------------
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . X X . . . . . . .
$$ | . . X O O . . . . , .
$$ | . 4 1 3 . . . . . . .
$$ | . . 2 . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .[/go]

I think this explains why is not a joseki move here and why the bot doesn't recommend it.

But I have seen quite a few SDK games where both players seem to be unaware of this pattern and then they may get this result instead:

Click Here To Show Diagram Code

[go]$$W
$$ ----------------------
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . X X . . . . . . .
$$ | . . X O O . . . . , .
$$ | . 2 1 . . . . . . . .
$$ | . 4 3 . . . . . . . .
$$ | . . 5 . . . . . . . .
$$ | . . . . . . . . . . .[/go]

Edit: I just tested this with KataGo and to my surprise, it wouldn't "punish" with the clamp here. It prefers the safe variation:

Click Here To Show Diagram Code

[go]$$W
$$ ----------------------
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . X X . 6 . . . . .
$$ | . . X O O . . . . , .
$$ | . 2 1 . . . . . . . .
$$ | . 4 3 . . . . . . . .
$$ | . . 5 . . . . . . . .
$$ | . . . . . . . . . . .[/go]

It already sees that as a 0.5 gain for black, compared to:

Click Here To Show Diagram Code

[go]$$W
$$ ----------------------
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . X X . 2 . . . . .
$$ | . . X O O . . . . , .
$$ | . . . . . . . . . . .
$$ | . . . 1 . . . . . . .
$$ | . . . . . . . . . . .
$$ | . . . . . . . . . . .[/go]

It doesn't like the complications of the clamp very much for black and from what I can find in online joseki libararies there may be ladders involved.
So it seems I was a bit too quick in relying on my own supposed "knowledge". It is more incomplete than I thought.

I wouldn't go crazy over whether to teach new AI joseki or old-time joseki. It depends on what is most used within a group of players. Some like AI style, while others like the 20th Century stuff. Not everyone will understand enough technique to be able to play AI-style (the last frontier). I would sooner have a group of players replay Honinbo Dosaku's games and play freely in their own games, applying what they learned from Dosaku's games. AI style is a very deep rabbit hole, so I wouldn't touch it until I'm 2D or stronger, at least without professional commentary to explain it.

Understanding joseki requires two things. One, a solid understanding of life & death and tesuji to know how the sequences arise in the first place and, two, a working understanding of opening theory to know how the choice of joseki impacts the strategic outlook of a game. Last Saturday I attended a micro-gathering with Christopher Sagner 6D on opening theory and direction of play. He told us that there are situations in which playing out a joseki to completion is actually counterproductive.