Ugly descent

Ugly descent  

In capturing races like this, the ugly-looking descent like here might be the key to overcome problems with shortage of liberties. In this case, it is the only correct move.

Ugly descent  

If hanes, then the clamp of is the next move to remember.

Ugly descent  

puts up a stronger resistance, but the same clamp at still works. While is a tesuji for gaining liberties, White is still ahead by one move because the ugly descent prevents Black from making the approach move at a.

Mistake  

If plays on the 1-2 point instead, then can throw-in. White can only respond by creating a ko with .

Mistake ( at )  

This is an elaboration on why in the previous diagram has to start a ko. Because if captures the stone, then after the descent at , Black has the cut at which prevents White's approach at a.

Mistake  

here won't do either. After , White has no good response.

Mistake  

There is also a belly attachment tesuji at , but it only results in a ko, unlike the unconditional capture achieved by the correct ugly descent move.