Neferneferuaten / Responding to hopeless invasions
Invasion by attaching to a stone
![[Diagram]](../../diagrams/17/dd35bace9bff05c7831cb6a36bda0c8e.png)
19x19 diagram
Let's consider this invasion.
![[Diagram]](../../diagrams/9/d7e35e1cf462c28fe33cd482374246d3.png)
19x19 diagram
Black is attacking a lone third line stone, so our immediate reaction should be to extend while blocking.
Defcon 5
![[Diagram]](../../diagrams/44/49cf5de955ad0535082db9c7fe7943d1.png)
19x19 diagram
If left undisturbed, white may try to make a base with `a` or gain corner territory with `b` or `c`.
![[Diagram]](../../diagrams/4/c72e952f371879eafb980998034e83a0.png)
19x19 diagram
If it gets to this point, katago recommends blocking, then invading black's eyespace.