All you need to know about Carpenter's Square-12
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Diagram 12.1: White to play

As will be shown, the missing stone at the hoshi point is a major defect for black.


Diagram 12.2: Solution 1

wants to use the same attach tesuji. White can simply play and , a combination that would not work in the standard Carpenter's square. But because of the defect at , black's eyespace is reduced and after the corner is dead in Bulky Five.


Diagram 12.3: Solution 2

is also possible. attempts to reuse the standard solution in Diagram 2.2. However, is good and black cannot survive.


Diagram 12.4: Solution 3

If black plays , white again can exploit the weakness at to reduce the eyespace. This corner is dead too.


Diagram 12.5: Solution 4

is also possible. Shown here is a different way to form Bulky Five.

Conclusion: this corner is very weak with the missing stone at hoshi point. There are a number of other ways to kill this corner. I will leave the readers to practice and find them all.
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