Sacrifice to gain tempo

Clever sabaki  

From a game between Jowa (White) and Hattori Rittetsu. According to Hashimoto Utaro, - is an instructive example of Jowa's cleverness at sabaki.

Keeping sente  

If Black takes with and , White gets sente to play a big point. It's still not easy for Black to attack the White group.

No Sabaki  

If goes here without the sabaki exchange, then (later) Black can attack at

Sabaki  

If White has support from the marked stone, then saves the day and can follow up at A or B.