: ( 648aa)
Black plays tenuki (in principle after KataGo's bad-shape move ) to capture White's single stone in the upper right without having played his kikashi of , in the hanezeki before.
In principle, Black loses two Main Semeai Liberties by this move. But becomes an approach-move liberty of his group, so the net effect of this move is a loss of one Main Semeai Liberty.

It will turn out that there is no need to do without this kikashi, because Black cannot get a better result - especially with Dany's Ko, where this kikashi might be in principle useful as an additional ko threat.

After a long time of research we had to accept that our original hope had not been fulfilled. Quite contrary, continuing without this kikashi is a source of complications, with the better end for White.

: (A 648ac; 120 648ah; B 648aj; C 648an; D 648ao)
The wedge at is White's strongest answer to Black's tenuki after her bad-shape move.

Trying with , , or , instead, will end worse overall for White.

We now know that White would not gain decisively overall if she played her gote move in the hanezeki.
If she did, she would decrease her score in the Capture Variation.

: ( D 648cm)
As "usual", Black captures White's just played stone immediately.

However, this is the moment, when Black has to play his kikashi in the hanezeki.

:
This kikashi should be left unplayed and kept as a potential ko threat.

We only realized this fact shortly before the 2020 update of our website was completed. We ask for your kind understanding that in this late phase of our elaboration we both felt unable to reduce the move numbers by two in many diagrams, and to restructure the variation tree.

: ( A 648co; C 648ct; D 648cw; E 648cx)
The order of moves is very important now.
Playing White's forcing moves (this means ; in itself does no harm) in the lower left corner first - blindly following the 119-tenuki-line that has , in the hanezeki at this moment already - is a grave mistake, if Black is able to answer both moves locally.

White must play at , instead, stopping Black from playing his kikashi in the hanezeki, while intending to choose Dany's Sacrifice in the lower left.
Trying with , lD or , instead, will end worse for her.

:
This forcing move is a grave mistake, if Black is able to answer locally (with ), just because he already has an eye in the centre.
In this case White has taken herself a Main Semeai Liberty at the left. In principle, Black unnecessarily got an additional Main Semeai Liberty at the right free of charge, often lifting him (at least) up to par with the Punishment Semeai Liberty Level.

However, even here, White should have taken her last opportunity to play at in the hanezeki. For the result, please refer to the appropriate subvariation two moves earlier.

: ( A 648fa;  B 648fd;  C 648fo)
Black plays KataGo's solid connection, but which is a grave mistake here, not taking in account White's option of Dany's Sacrifice in the lower left.

However, Black could do better by playing his kikashi in the hanezeki now, or preventing White's throw-in in the lower left corner by the connection at .

Joachim found that this is the moment - just after White played her move in the lower left corner - to give atari at White's two stones with a move at , returning to what I thought to be the main line with the best final scores for Black.
If White chooses Dany's Sacrifice, there is no need for Black to connect at in the left centre, so he gains one move back in the Main Semeai.

: (A 648fx; B 648fz)
White throws-in in the lower left corner, choosing the usual follow-up move.

She will be worse, if she prevents Black's kikashi in the hanezeki by playing herself, or if she blocks at at the top.

:
Black captures White's single stone at the upper edge.
This gote move makes a bad thing worse (Black is two moves under par with the Punishment Semeai Level thereafter), and has been played under the firm assumption that White saves her two stones in the lower left.

: (A 648ga)
White blocks at the upper edge.

This move does not do any harm here. However, it would be better for White to continue with the Main Semeai, instead.

:
Black connects at the upper edge, losing another move in the Main Semeai once again.

However, it would not benefit him to continue with the Main Semeai now, because he would still suffer from the Punishment Semeai.

:
White continues with the Main Semeai.

: ( A 648gb)
Mistakenly I assumed for a very long time that White always connects her two stones in the lower left that were in atari.

As we now know, White must continue with the Main Semeai here.

Black must not play any reduction.

Please note that Black has to capture at , before approaching White's group in the lower left corner with a move at .
Here, Black will also play the kikashi of , in the hanezeki, just because White - after her mistake with connecting her two stones in the lower left before - does not want to prevent it.

: (C 648gc)
White continues with the Main Semeai.

Please refer to the subvariations of this move for a detailed explanation of the problem's behaviour with this White's gote move at .

Capture Variation:

There are no changes to the superordinate variation.

White + 2 => White + 2

In the scoring diagrams, the previously mentioned additional moves - which will be played after the previous diagram - are shadowed.

Semeai Variation:

There are no changes to the superordinate variation.

Black + 4 => Black + 4