(Referenced by 865)

: ( 230)
White starts the ko "early".

Ko:

: (A 336)
If Black does not recapture the ko, but lets White connect, we can easily check whether the ko really is a valid option for Black - it is!

Ko: ; ; ; ; ; ; ; ; ; ; ; ;

:
We will see below that some of Black's potential ko-threats in the nakade will remain unused in the end. Therefore, simplifying the diagram by not using the atari of as a ko-threats does not change the matter.

Ko:

:
Black's group has fallen below the Punishment Semeai Liberty Level, so on the left side is no valid ko-threat any more.

:
Here, White is not able to choose the "fake" Punishment Semeai with capturing the hanezeki's tail with a move at ( 359), instead, because Black's group has one liberty too many.

:
White's centre group has four liberties left, so the atari of on the upper edge is no valid ko-threat.

:
White wins the semeai by one move; Black is prevented from giving atari with a move at .

White did not need to use any of her ko-threats in the upper left corner, starting with a move at . This is the same result as with the "late" ko.