All you need to know about Carpenter's Square-28
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Diagram 28.1: White to play

Can the external liberty make any difference?


Diagram 28.2: White fails

The external liberty is clearly helpful. If white applies the solution of Shape 27, black is able to play so the corner is alive. White has to change strategy.


Diagram 28.3: White fails

is the key point. However, is incorrect. is again a calm move. Black is alive. If mistakenly plays at first, then a ko fight in inevitable.


Diagram 28.4: White fails

doesn't work either. is good. Please verify the corner is alive.


Diagram 28.5: Solution

is a brilliant move, forming a ko fight easily.


Diagram 28.6: Variation

is useless. Black can only create a different ko fight, which is favourable for white because white takes the ko first.

Conclusion: Diagram 28.5 is the best for both sides.

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