Diagram 1 - "Double Sparrow (双飞燕)"
Diagram 1 – “Double Sparrow (双飞燕)”

Diagram 1, looking at White pincer at move-2, Black move-3 pincer back, followed up until move-9, is a commonly seen shape,  how should white continued after this?

If White tenuki, Black a connect is strong move.


 


Diagram 2,  White kosumi move-1, preventing Black to connect, Black extension move-11 cannot be omitted, otherwise White B forcing press is very critical.White is in position of senteWhite has invasion at C.

Diagram 3, White move-10 hold black’s stones isn’t a trendy move already. However, if Black plays move-c, White can tenuki due to the sufficiency of thickness.  Alternative, White’s move-10 can be played at a or b too.

Diagram 4, White forces at move-1, sought to come from both sides. Black move-2 prevent White to peek at a in sente. White has outward influenc, also later if White b will be equally beneficial, black has bit loss.



Diagram 5, Regarding the White move-1 pincer, Black move-2 is a strong hand forces White to move-3 while protecting cover-up, Black tenukiBlack is better now compared to Diagram 4.

Diagram 6, Black move-2 kosumi, while preventing White to steal Black’s territory away at A, also helps to forcefully head outward is playable for both.

Diagram 7,  Black can do move-2 pressed, is a strong move, After White move-3 hane exchanged with Black move-4, the invasion move A from Diagram 5 has disappeared then move-6 cut is big value, Black is satisfied in this diagram.



Diagram 8, When Black move-2 pressed, White can sente at move-3 thus White hane move-5 creates a different situation. White has advantages in this fight if Black move-8.

Diagram 9, Hence, Black move-8 must hane here to force White to cover at move-9. The follow-ups result even.