Gokyo Shumyo, Section 4, Problem 7 / Solution

[Diagram]

Solution: ko

B1 is the point. White has a stubborn defense W2 threatening a throw-in at B3. Ko is the solution (Black may play B5 at B7 making an outside ko). Other defenses all fail...

[Diagram]

White attack from outside

B3 is an often-seen sacrifice cut to gain a liberty.

[Diagram]

White attack from inside


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