DaveSigaty: is not the only entry point in this formation but it is one of the basic starting points. What happens next? Should Black start elsewhere instead?
(This is the 364473 enclosure and this link is put in to create a backlink from there.)
DaveSigaty: on the wider side is perhaps natural.
will allow Black to live.
is one of a variety of counters but there is no way to prevent Black from living if he is willing to do so on a small scale in gote.
This is perhaps White's strongest attempt to prevent Black from living. However, Black forms a seki with no problems.
This ko with ,
,
is another very common idea for invading under a small knight enclosure. It is a more aggressive approach than just seeking a small life. Black is happy either to live on a larger scale via the ko or take a suitable profit elsewhere in exchange for the corner.
In this particular case where White has played the large and small knight combination, White has a problem trying to eliminate the corner aji. Black need not be in a rush to invade because there is no efficient follow-up play for White here that will prevent an invasion. Note as well that in all the variations above the stone is not well placed.
JanRamon: Black 1 is one possibility. If white 2, 3 reverts to the ko variation. If white does not play at 2 (or A), black can play at A.