![figure 2](BST/shu2.gif)
![star](star.jpg) ![star](star.jpg) ![star](star.jpg) Position 6 (later in the game) : now, what was Black answer to White attack at 126 ? Solution and commentaries
III. Ladders and other incredible sequences.
![piège](BST/psh0.gif)
![star](star.jpg) ![star](star.jpg) Problem 4 : White to play and live with the SE group Solution and commentaries
![piège](BST/gembi.gif)
![star](star.jpg) ![star](star.jpg) Problem 8 : White to play and capture the marked stones Solution and commentaries
![piège](BST/hats.gif)
![star](star.jpg) ![star](star.jpg) ![star](star.jpg) Problem 9 : White to play and save the marked stones Solution and commentaries
![piège](BST/noman0.gif)
![star](star.jpg) ![star](star.jpg) ![star](star.jpg) (?) Problem 10 : White to play ; what happens if he tries to save the south edge group ? Solution and commentaries
![piège](BST/seki.png)
![star](star.jpg) ![star](star.jpg) ![star](star.jpg) Problem 11 : White to play ; what is the result ? Solution and commentaries
IV. Semeais, sekis and pseudo-sekis
![Figure 1](BST/f01.gif)
Figure
1 : who wins the semai? Solution and commentaries
Figure
2 : White to play ; who wins the semai? Solution and commentaries
![Figure 2](BST/f02.gif)
Figure
3 : what is the result of the fight ? Solution and commentaries
![Figure 2](BST/sob.gif)
Figure
3bis : what is the result of the fight ? Solution and commentaries
![Figure 3](BST/f03.gif) Figure
4 : what is the result of the fight ? Solution and commentaries
Semeai
5 : Black to play and win the race Solution and commentaries
![Figure 6](fo4blog.gif) ![star](star.jpg)
Figure 10 : what is the result ? Solution and commentaries
![Figure 6 bis](fo5blog.gif)
![star](star.jpg)
Figure 11 : what is the difference with the previous position ? Solution and commentaries
![star](star.jpg) Figure 12 : and what is the result in this case ? Solution and commentaries
Figure 13 : an asymmetrical seki Solution and commentaries
![star](star.jpg) Figure 14 : what is the strange relation between those three positions? Solution and commentaries
![star](star.jpg) Figure 15 : sekis or false sekis ? Solution and commentaries
![figure 10](GO/seki31.gif)
![star](star.jpg) ![star](star.jpg) Figure 16 : what is the result ? Solution and commentaries
![Figure 1 (W 0 -- W 0)](fo2blog.gif)
![star](star.jpg) Figure 17 : what say the rules? Solution and commentaries
![Figure 11](BST/f0110.gif)
![star](star.jpg) Figure 18 : what say the rules? Solution and commentaries
![Figure 11 bis](BST/f011.gif)
![star](star.jpg) ![star](star.jpg) Figure 19 : how must the fight be played ? Solution and commentaries
V. Problems about rules.
The following positions illustrate relatively common superko situations (see here for solutions and commentaries)
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