(Referenced by 222gh)

: ( 222ao)
White plays the tsuke of Yamada Shinji 6p.

We will discuss Yamada Shinji's tsuke in the modern line of play, i.e. with Guzumi Exchange, in detail later ( 222gh).

: ( 102 222bc)
White draws back immediately.

As we know now, cutting at , instead, is better for her.

: ( A 222bq ; 103 222br)
Black plays the hane at the first line first.
To be honest, I accidentally got mixed up in the order of the moves, probably because KataGo (2020) did not want to play Yamada's move at any longer.

However, he would gain one point overall, if he descended to , instead.

Please note that Yamada found his improvement over the "classical" atari in an aera, when the endgame at the left side was played "late". Once the lower border of Black's upper left corner was settled, none of KataGo's current findings would be applicable any more, and playing at would be feasible.
Additionally, Black had played the guzumi in the upper right in due time before his tsuke in the upper left, which provides Black's large group at the right with an additional liberty. This additional liberty will make a very decisive difference even in the upper left, as Black might not be bound any longer by the immediate danger of pushing himself below the Punishment Semeai Liberty Level.

: ( 103 222bs)
White cuts in the corner, as she also did in the original line of play with after Yamada's tsuke.

However, as we know now, it would be better for her to immediately force by connecting at .
Black's upper left corner is weaker that it seems, so Black would have to answer passively.

: ( 105 222bt)
Black gives atari at White's two stones at the top, in principle reverting to Yamada Shinji's original sequence.

However, with his upper left corner severly weakend by the unsettled border at the left, he should better give atari at White's cutting stone from the inside.

: ( 105 222bv ; ((B 222ds)
White captures at the top, reverting to the original line of play.

KataGo recommends playing at , instead, which will give Black a very nasty surprise.

In the beginning of our investigations, I once assumed that the ensuing ko fight (in the subvariations) would be easier to handle for White without than with Guzumi Exchange, because White would be able to use liberty-occupying moves of the Main Semeai as ko threats.
However, as it turned out later, I apparently overlooked that Black already had the atari at White's two stones in the lower left in place, providing him with some advantage there.

Following Joachims suggestion of capturing the nakade "early" - just before initiating the fight in the upper left corner - will drastically change the character of the ko fight in the upper left corner in White's favour.
Black will be forced to choose another line of play, in order to optimise the final score.

: ( C 222ed)
White starts the endgame at the left side a bit too early here.

However, it would be better for her to insert the atari of in the upper left before.

: (A 222ej ; B 222en)
Black closes his upper left corner.

Capturing White's two stones in the lower left with , instead, would be too early. White would benefit by one point overall.

The same is true for pushing with in the upper right.

:
After this move, Black is par with the Punishment Semeai Liberty Level again.

: (117 222eo)
White sacrifices her two stones in the lower left and defends in the guzumi area, also continuing with the Main Semeai.

Here, in the line of Yamada Shinji's tsuke, she should not connect her two stones with , instead, as she would be unable to play the wedge in the left centre (shown below) thereafter. Black would gain one point overall unnecessarily.

: ( 119 222ep)
White makes sure that Black cannot establish any territory below.

However, she would benefit by one point, if she played the wedge at , instead.

:
In principle, we have reached a change in the order of moves with Yamada Shinji's tsuke played "late" ( 222ft).

The final scores of the game will become Jigo / Black + 3.