(Referenced by 366; 367; 451; 475)

: ( 440)
Black connects solidly.

:
White gives atari from the left, and prepares the ground to gain an advantageous ko.

: (86 444)
If played at , there is a ko, too. However, it will result a double-ko that Black cannot win. So, the ko here is more advantageous for Black.

:
White starts the ko.

Ko: ; ; ; ;

:
White has this local ko-threat at her disposal.

:
White has another local ko-threat.

Ko:

: (116 446)
If Black plays at , instead, he will also lose.

:
White might think to give atari at , as a ko-threat, but this threat is too small. After Black ends the ko with , the best White can hope for is to save some of her stones on the left side, with a move at . But Black will simply answer at , and all his stones on the left side are safe.

: (B 447)
If Black dissolves the ko with a move at , he will lose all his stones on the right side of the board outright.

:
Black has no ko-threats left. White wins by approximately ten points.