黑：依田紀基 (tenho-) 白：夏衔誉

Since 黑17 deviates from the usual extension at A (see pro game below), white has no mood to defend at B otherwise the position of 黑17 is better than extension at A.

黑：羽根直樹 白：尹俊相

白16 extension forces black to defend at 黑17 and gains sente to press at 白18. The downside of 白16 is black can peek at 黑23 and exchange with 白24.

This discussion will analyze how severe if white tenuki after P2 and black blocks at triangle.

Cramming in the corner is quite tough for white to 忍; 白20 counter is the 心情. Variation up to 白26 is 一本道. 黑27 can play either A or B.

If black extends at 27 then white can live comfortably in the corner. After 白28, black's exterior has flaws around O3 area. 黑29 direct attacking is not so severe; white can defend lightly with 白30 and 白32.

黑27 puts more pressure on corner white group. If white is not careful and blocks at 白28 then the result is disastrous.

Correct response is to tenuki and play 白28. Corner white group is ko live no matter how black plays.