Big Eye liberties example 3

6=12  

An internal eye of six points is worth twelve liberties in a semeai. However, in a six-point big eye which is dead, black has already got a stone in it, so this reduces the actual liberties to 11.

6=12 continued  

It may look like White cannot win since Black has 11 outside liberties, but the six-point big eye gives White 11 liberties as well. So if White has sente...

6=12 (diagram 5)  

And Black is captured.