parallel ladders
Here White has a choice of parallel ladders.
Because breaks just one of them, White must be careful.
and
are the correct way.[1] Now Black's stones can't escape.
Bearing driving in mind
Moving closer along the diagonal does change things, White might then want to play
,
and
here instead: a driving tesuji.[2] It all depends on the direction of play whether capturing Black on the left, or blighting
on the right, is bigger.
[2]
Calling either ladder correct is questionable, when the net at also captures Black's stones. If Black tries to escape, say with
, White can play atari. Note that the net works even if there is a black stone on the circled point.
-- Bill
It is painfully easy to miss a knight's move net like in a real game (
at a fails much more obviously). Up to
Black looks to be well set to escape.