: ( 243)
White captures Black's nakade stones on the left side.
This is the move that has been used by us for a long period of time, but - as we now know - there is a much better one, resulting in success here. White must play at , instead, ( 250).

, :

Both sides follow the main line of Joachim's Ko-Semeai ( 227).

: (A 253)
It seems that the "late" ko, displayed hereafter, does not work for White any more. White does not have any ko-threat in the upper left corner, because Black's marked stone is already in place.

Neither will an "early" ko, starting with a move at just now, be successful for White.

, :

A tesuji, designed especially for Black's potential ko-threat at . Playing at , instead, would be equivalent for White. This is also shown in the theory chapter as FLAG 2a ( 1003), and as FLAG 2b ( 1005).

Ko: ; ;

, :
White uses the filling-in of her false eyes as ko-threats.

:
Black's ko-threat in the hanezeki is suicidal, due to the tesuji, White played before, with , and . However, White's group on the upper edge has only three liberties left - vs. four liberties for Black's group on the bottom - so this will not have any decisive effect on the outcome.

:
White has no effective ko-threats left, and can do nothing more than to stop Black from using his potential ko-threats in the nakade.

:
Black captures the ko for the last time. There is nothing that White could do to pre-empt Black's atari at . Black will win the game with ease. White has started the ko too late.