Connect! Example 2a

Black has two framework stones (marked with arrows pointing to the framework link). It is Black's turn to play. Can Black follow the prime directive?

Connect! Example 2b

A play at A would ensure the life of the lower black stones (by providing enough eye space to form two eyes) and the upper black group can just live too. But scrabbling for eyes is a desperate measure and here would lose the game. If following GCS, the question to ask is how to connect. Here there is only one option left - to kill the intervening white stones. Black 1 makes B a false eye. If White were to play at the intersection occupied by black 1, the white group will get two eyes and thus live, ensuring that the framework link is destroyed. But after black 1, Black can kill the white stones before White can kill the lower black group.