Beginner Exercise 231 / Solution

Sub-page of BeginnerExercise231

In this problem, Black must watch out for the liberties of the group, so Black cannot make every possibe sente moves in the attempt to live.

Solution (6 at 3).  

B1 immediately makes an eye, forcing W2. Without playing anything else, immediately make a throw-in at B3 and catch the three White stones in a connect-and-die with B5 for the second eye. If W2 is played at a or b, then B3 continue as shown in the diagram.


If W2 avoids the connect-and-die, then B3 captures three White stones in a connect-and-die.

Failure I.  

Do not make unneccessary sente moves like B1, because it reduces Black's liberties. After W6, Black cannot atari at a without putting the entire Black group into self-atari, so Black dies. B1 at W2 is a similar failure, W2 at B1 kills similarly.

Failure II.  

Ahthough B1 captures three White stones for an eye, it is played in the wrong order and so W2 destroys the other eye and kills. Note that this is similar to the box connection, a and b are miai for the connection.

Realistic play  

Bill: After B1 lives, W2 - B3 are sente, as are W4 - B5.

Realistic play (ii)  

Realistic play (iii)  

Then W1 - B4 are sente, leaving behind the small ko.

proto: I'd venture to say that this is not "realistic play" separate from the "solution" to this problem. I would say that this is the solution to the problem. This should be the solution at the top of the page, not an add-on footnote at the bottom of the page.

Beginner Exercise 231 / Solution last edited by ProtoDeuteric on November 14, 2007 - 10:34
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