Beginner Exercise 151 / Solution

Incorrect (1).  

is incorrect.

• If White continues with a, b, or d Black captures with c and escapes.
• If White continues with c, Black responds with a. Then no matter which of b or d White chooses, Black captures or escapes with the other.

Incorrect (2)  

is incorrect.

• If White moves next with a or b, Black chooses the other.
• If White moves next with c or d, Black chooses the other.

Correct solution

Solution.  

is the correct solution. If Black moves anywhere except , White captures four pieces by moving there.

Alex Weldon: Worth showing the diagram for the oiotoshi since not all beginners will see it.

Variation, worse for Black  

If Black captures with the White stone (that had been at a) by playing the marked stone, White plays and catches four stones in oiotoshi (connect-and-die). If Black connects at a, White b catches all 9 stones.