Beginner Exercise 2 / Solution

Sub-page of BeginnerExercise2

After B3, White can't play at a because of shortage of liberties.

If White plays at b, Black can later play at a. White can then capture Black's stones, but that leaves her with a three in a row shape.

See also rectangular six in the corner.

Failure diagrams (Jasonred, ArnoHollosi):

Incorrect: leads to ko for life  

(The question says "kill White without ko".)


What if White plays somewhere else?

If White answers with W2 here, Black plays B3. White would like to play at B3 as well, if Black plays at a or b. Why?

Bulky five  

Because if we add white+circle to the 2x3 square we get a shape called bulky five (marked). And that shape can be killed by playing on the vital point, marked with a square.

Bulky five (again)  

So, after B1 and W2 in the Variation diagram, we have a bulky five shape, with one point already occupied by Black. However, the vital point marked with a square has not been played yet. That is why Black plays at B3 next. (And that is why White trying to live with W2 in the first diagram seems like a good idea - but fails as well.)

Try to memorize the bulky five shape. It occurs over and over again.

See also:

Beginner Exercise 2 / Solution last edited by on February 9, 2014 - 11:55
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