Chokchoksu (Shortage of Liberty)
This is a capturing method by using shortage of liberties.
![](/images/exam_pics/dia01_1.gif)
White's marked stone has only one liberty.
![](/images/exam_pics/dia01_2.gif)
Of course, Black can capture a White stone with 1, but White saves the three stones with 2.
![](/images/exam_pics/dia01_3.gif)
However, Black 1 captures the four stones by using the shortage of liberties.
![](/images/exam_pics/dia01_4.gif)
If White plays at 1, Black captures the whole chain with 2.
Snapback
A snapback is the method which captures the opponent stones by sacrificing your stone. In real games, this kind of sacrificing skill is very useful.
![](/images/exam_pics/dia02_1.gif)
Two marked White stones have two liberties.
![](/images/exam_pics/dia02_2.gif)
Black 1 here helps White to save the marked stones with 2.
![](/images/exam_pics/dia02_3.gif)
Black 1 is a good sacrifice . After White 2.
![](/images/exam_pics/dia02_4.gif)
Black captures three White stones with 1.
Net
A net is a capturing method which kills the enemy stone(s), by blocking both directions without filling the liberty directly.
![](/images/exam_pics/dia03_1.gif)
Playing Dansu is not the way to capture the marked White stone.
![](/images/exam_pics/dia03_2.gif)
Black 1 is a good move to capture the White stone.
![](/images/exam_pics/dia03_3.gif)
If White tries to escape with 1, Black blocks at 1.
![](/images/exam_pics/dia03_4.gif)
Up to Black 2, White's group can't escape from the net.
Ladder
A ladder is a method to capture the opponent's stone(s) by playing Dansu continuously without being captured.
![](/images/exam_pics/dia03_1.gif)
The marked White stone has two liberties, but Black can capture the stone by playing Dansu continuously.
![](/images/exam_pics/dia03_2.gif)
Black 1 is the correct direction to capture a White stone.
![](/images/exam_pics/dia03_3.gif)
This diagram shows a successful ladder.
![](/images/exam_pics/dia03_4.gif)
Black 1 here is wrong. After White 2, Black can't capture the White group.