Sacrifice five to kill
Difficulty: Beginner Keywords: Life & Death
This is the technique in its abstract form. It involves a capturing race in which the attacker willingly sacrifices 5 stones ...
... to next kill with a throw in and a play at the vital point. Incidentally, the throw-in is better style than playing immediately, for reasons of ko threats and ko value.
The crux is to create potential for throw-in, and not, as here, allow White to capture four stones solidly, after which she is alive.
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Reference
This technique is mentioned in the hard section of GoGameGuru's problem set week 14.