When Black follows up with
, making a staircase pattern supported by the initial stone, this is quite a dangerous way to play, compared with attach-extend. There are not so many situations in which it is a good option.
In most cases Black can't play this way, because White makes a ponnuki with and will be very happy just to connect in reply to
. Black's three cutting points are hard to manage, while White has no problems.
There must be a good reason for playing into this shape. For example, this fragment of a Korean professional game. Black has a big framework to the right, and can play after
connects as a play that builds it up into the centre. There is now a feeling that
isn't ideally placed, too.