All you need to know about Carpenter's Square-22
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Diagram 22.1: White to play

We already learned that attacking at 'a' from outside is not working. What else?


Diagram 22.2: Solution

is urgent. If connects, after forcing moves and , simply reduces the eyespace to kill.


Diagram 22.3: Variation

If , is a good move. White again can kill straight-forwardly. at 'a' is useless too.


Diagram 22.4: Variation

is an alternative way to kill. After , 'a' and 'b' are miai points.


Diagram 22.5: White fails

gives away the key point to black. There is no way to kill this corner any more.


Conclusion: This shape is quite simple. As long as white gets the key 2-2 point, black has no chance.


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