High invasion of mixed three space extension
One of the three-space extension invasions is on the fourth line at the centre of a mixed-height extension.
| Table of diagrams Invasion Unreasonable: White cuts White lives too low White sacrifices When White has a supporting keima Another idea with a keima |
is not as common as the invasion at a (see low invasion of mixed three space extension), because Black's response at a will usually connect the two black stones together. Alternatively, Black may choose to attack
with b.
alone is usually not a good play: usually
is used in conjunction with a white stone at c.
Trying to cut with
is unreasonable. In this diagram, White has achieved nothing. If
is played at
, Black will cut at
.
Trying to live this way is too low for white, and tends to give away too much influence to Black. Later, Black a will capture
.
Normally the wedge at
is too big a sacrifice because it gives Black a ponnuki, but in some specific situations separating
may be worth the sacrifice. In some other situations
may be played at a, but Black b can seal the white group in.
![[Diagram]](../../diagrams/24/350d531e881a63ce8d8f9674a54b9aa7.png)
![[Diagram]](../../diagrams/52/ecedc7b77800641d8e48dad5b1e95368.png)
![[Diagram]](../../diagrams/15/7ca273f81a79e44ab130e642fd5b4c6d.png)
![[Diagram]](../../diagrams/24/00fd86cafd6f693432e3037c36ce99f2.png)
![[Diagram]](../../diagrams/20/3eea35fdc0d793de727f718cc4bf7b1d.png)
stone
. When
tries to connect,
works in co-ordination with ![[Diagram]](../../diagrams/2/e4db88a2e0a27edf97f5fc65ed47b74f.png)
.
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published under the ![Sensei's Library [Welcome to Sensei's Library!]](../../images/stone-hello.png)