4463 enclosure second-line side attachment
This position arises from 4463 enclosure 2-5 approach. White can wedge at a or extend at b. at c is a trick play which requires knowledge of a clever tesuji to refute.
There is no choice for and , but is sometimes played at instead.
This is the most common continuation, but may be played at or elsewhere. After , White chooses between a and b.
In a 2012 game commentary at gogameguru, An Younggil, 8p, says this sequence was taught to him as joseki as a pupil, but today it is regarded as too good for Black. Because of this in the previous diagram is rarely played nowadays, and white almost always plays the extend variation below instead.
Incidentally, White can live this way, but it is small life. Still, as an invasion pattern it must be known.
Playing seems to lack fighting spirit, but it is sometimes seen. After and , white should continue at . It's vital shape point. If White omits the move, black pushes at the point, and it's actually like hitting the head of 2 white stones , very painful for white.
Black will nearly always defend at . The following moves depend on the surrounding position, but white will probably play at a or b next, then black can either continue to attack the white group or else tenuki.
is a trick play. The natural move is a, to connect, which is falling for the trick.
Up 'till , Black is forced into a low position. Compared to black's initial strength, White gets too much influence here. The - exchange now looks very silly.
is the stronger reply, but requires knowledge of a tesuji.
The Patting the raccoon-dog's belly tesuji is applied with and .