User:GiB

Test page

Capture patterns

Example 1

The shaded hex can be any color.

Example 2

Any blue intrusion can be killed:

All blue pieces are dead, so Red 1 captures the whole area

reply by Eric Demer:
The region becomes red-captured after the ​ ​ ​ blue 2 ​ , ​ red 3 ​ ​ ​ exchange
but it isn't red-captured red-captured before that exchange.
https://hexworld.org/board/#6x4c1,:pf1:pf3:pc3a3a4e2b2b3 is a witness position for one of the intrusions.