Weak Carpenter's Square
The weak carpenter's square is a carpenter's square without the connection at the corner of the shape. The vital point of 2-2 is more emphasized and this time White kills the corner by playing at a. b and c may also kill depending on outside situations.
That is, without the black stone at
, changes the status of the group from "White kills by ko" to "White kills unconditionally".
If Black plays first, almost any move lives. If
is occupied by a White stone, only a works.
| Table of contents | Table of diagrams Weak carpenter's square White can kill White can kill White can kill variation Endgame technique not really a carpenter's square not really a carpenter's square |
Corner Vacant
After
a and b are miai: a White play at a creates a squared four, while a White play at b forces black to connect at c which reduces his eyespace to a bulky five.
Corner occupied
When the 4-4 point is occupied by White, there are many ways for white to kill after
. This is just one variation
After
,
at
is an auto atari so Black has no other option than to let white connect at
.
If Black has secured life by playing on the vital point, there is an important endgame technique for White to remember: the forcing moves at
and
.
![[Diagram]](../../diagrams/2/dce8bb64ab5dae4f357ad5832fa9663f.png)
![[Diagram]](../../diagrams/14/532f51a95d064d13f35a9334b1f44401.png)
![[Diagram]](../../diagrams/27/b31ede7a861262157e19884e756c6995.png)
here, then ![[Diagram]](../../diagrams/44/e4fc3632cfa04d15f791428218d3baa8.png)
![[Diagram]](../../diagrams/6/4ae85df62827de6db4374ab23a454fe2.png)
![[Diagram]](../../diagrams/32/d974f4bdb03a2580afdf543a6add0bdd.png)
![[Diagram]](../../diagrams/28/fa064185e1d1cf6e676eacc94699b98d.png)
![[Diagram]](../../diagrams/50/8b69348d65177999999e548971fbf291.png)
2024 the Authors,
published under the ![Sensei's Library [Welcome to Sensei's Library!]](../../images/stone-hello.png)