(Referenced by 1092l, 1092p)

: ( 738a)
This "classical" atari in the upper left corner is White's last hope, but will still end in vain.

: ( 109 738h)
Our first idea was to let Black play three defensive moves in the top left corner, starting with this block.

:
However, as we now know, Black has to capture White's pair of stones immediately with , to avoid losing the game.

: ( 109 738g)
Simply following Black's intention is too easygoing.

:
It would be better for White to only allow Black defending once, and play the atari at , instead.

: (109 738f)
Black now plays the atari at the right, capturing White's pair of stones.

Quite surprisingly, Black must not follow the "usual" course of the endgame by connecting at in the top left corner any longer.

:
White has to further reduce Black's territory in the upper left corner first.

She will lose the game by playing at , instead, immediately destroying Black's second eye for his large group at the upper right.
, and would revert to the subvariation, wherein White answered Black's kikashi in the bamboo joint by immediately connecting at ( 738b = Black + 3), but with White's two -stones additionally captured (= Black + 7; so White would choose the Semeai Variation, instead, with a final score of Black + 5).

: (124 738e)
Black connects.

:
does not threaten the life of Black's top left corner, so Black might want to play at , instead, securing the second eye for his large group in the top right.
This measure will provide Black with a gain of a few points, sufficient to win the game.

///:

The comparison of the final positions in the left half of the board (Professional Solution at the left) shows:

• Black lost ten points of territory () through White's reduction of his top left corner.
• White did not capture Black's single stone at the bottom left, so losing two points of territory ().
• White captured one Black stone at top, so gaining one point of territory ().
• White gained one point of territory at the top ().

The comparison of the final positions in the right half of the board (Professional Solution at the left) shows:

• White lost four points of territory (), due to Black's hasami-tsuke.
• Black gained four points () by capturing two White stones.
• White secured one point of territory in the centre ().

In total, White is three points better than in the main line of the Professional Solution.

White wins by three points.

The outcome of the game (in the case that Black has captured two White stones in the upper right, but did not get a second eye) depends only on the development in the upper left corner that can be considered to be independent from the mutual occupation of liberties in the Main Semeai thereafter.
In order to ease the calculation of the final score for other subvariations in the upper left corner, we will determine the territory count in the non-shaded area of the board:

• Black will get eleven points of territory (, ).
• White got seven points of territory already (, , ).
• White won the game by three points, so ...

Black needs a surplus of seven points in that area for reaching a jigo.