: ( 649ao)
White plays the wedge in the left centre.

:
Black atari from the outside starts the usual continuation.

:
White's atari in the left centre is KataGo's favourite now.

If White wanted to initiate Dany's Ko, she could play at immediately, keeping this atari in reserve as a ko threat.

:
We choose Dany's atekomi here, in order to discuss Dany's Ko.

KataGo's favourite, however, is the kikashi of in the lower left corner. After Black's best response with taking the point of himself, White would throw-in at , achieving final scores of White + 2 / Black + 4.

In principle, this is similar to a later subvariation ( 649at), where White played her kikashi earlier. Please note that the different treatment of the upper left centre therein does not affect the final scores of the game.

:
The ko fight begins.

:
Black is forced to connect his two stones.

:
White has to capture the nakade.

:
White has to play her kikashi in the lower left corner first.

Immediately connecting at at the upper edge would be mistaken, losing one point overall.

:
Black has no other valid option than to connect at the lower edge.

: (151 649aq)
White connects her single stone at the upper edge.

White has no chance to successfully play the wedge at in the right centre, which was part of our older sequences and resulted in a White win by two points in both Main Variations.
If she did here now, she would lose two points in the Semeai Variation unnecessarily.

:
Black secures an additional point of territory in the right centre.
This move benefits him by one point in the Semeai Variation, compared to our older sequences in the context of Dany's Ko.

Black plays 2/3 reductions.

If he played 3/3 reductions, the scores of the Main Variations would be interchanged.

Before the end of the game, Black will have to capture at .

Capture Variation:

Compared to the superordinate variation ...

• White got an additional two points of territory at the upper edge.
• Black destroyed White's territory in the left centre, but lost one of his stones there, so his net gain is one point.
• Black got an additional point of territory in the right centre.

In total, gains and losses compensate for each other.

White + 2 => White + 2

Semeai Variation:

Compared to the superordinate variation ...

• White got an additional two points of territory at the upper edge.
• Black destroyed White's territory in the left centre, but lost one of his stones there, so his net gain is one point.
• White captured an additional stone in the right centre, but lost two points of territory there, so the net effect is zero.

In total, White gained one point.

Jigo => White + 1