: ( 364)
If White plays the oki on the left side immediately, ...

: (95 379a)
... Black might want to pre-empt White's kikashi with this atari, in sente.

KataGo prefers doing without this exchange in the upper left corner.

:
For demonstrative purposes, White again starts the ko "early" here.

Ko: ;

:
In the top left corner, Black had two ko-threats, with , and ; White had one ko-threat, with . The difference is the same as in the main line of this sub-variation (four vs. three).