Don't throw in tesuji

Black to play  

After White captures ...

Mistake  

... it is tempting to throw in again but this would be a mistake.

Solution 1  

Black should start at . If White defends here then Black captures the whole lot. After all seven white stones are dead.

If white plays at 'a' after then black can play elsewhere! Then, after white 'b' and black 'c', white 'd' does not work because of a shortage of liberties.

Solution 2 - at  

If White connects to the outside, there's shortage of liberties and Black can capture two more stones at .

The name was coined by Matthew MacFadyen.

The tsumego used in this example is #26 from the XuanxuanQijing.