(Referenced by 287; 415; 875)

: ( 227)
Over a long period of time, we - erroneously - thought that it might be possible for White to win without fighting a ko, if she played the kikashi in the upper left corner latest now.

However, the endgame seems to become extremely close. The hanezeki in the lower right corner will remain stable, so the two prisoners that White got with Black's earlier double throw-in might become a decisive factor for White's success.

Michael Redmond was so very kind to adjust several technical incorrectness in our previous sequences, which followed the sub-variation for (= ) below, and also provided us with some very surprising variations, concerning the correct play in the upper left corner.

: (A 271; B 272)
If White tries to take Black's second eye with a move at , instead, she will lose the ensuing semeai with her group at top.
If White plays at , she will lose clearly on territory, when she does not return to the following sub-variation of Joachim's Ko-Semeai here.

: (C 273)

End of 2014, Joachim found out that Black is able to win by saving his nakade stones on the left side ( 875), instead of losing the game after living with his large group in the upper right (this was our previous assumption).

: (A 282)
White secures the second eye for her group on the left side.

Reducing Black's group in the upper right to one eye only, by taking the guzumi point of , will not help White either.

:
But Black lives on the right side, too.

:
White is unable to severely reduce Black's upper left corner, and so will clearly lose on territory.