Approach Ko

Refusing quadrupal ko

This is a key game from yesterday's Samsung Cup preliminary tournament between Na Hyun 3-dan and Shi Yue 9-dan.

All you need to know about Carpenter's Square - 25


Diagram 25.1: White to play

All you need to know about Carpenter's Square - 16


Diagram 16.1: White to play

Black is blocked from the bottom side instead. This shape is commonly seen in real games. What can white do?

All you need to know about Carpenter's Square - 10


Diagram 10.1: White to play

Black has no external liberties but hanes at both sides. Can white do anything?

All you need to know about Carpenter's Square - 9


Diagram 9.1: White to play

We will now consider the Carpenter's corner with one extra liberty as well as one first-line stone.

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