Edge template IV2k
From HexWiki
Template IV2-k is a 4th row edge template with 2 stones.
Red can guarantee to connect the stone marked "↑" to the edge. Red can also guarantee the other stone to be connected to the edge (using the ziggurat template), but not both stones simultaneously.
(From Mike Amling, see: www.drking.org.uk)
Defending the template
Red has two threats:
and
using the ziggurat.
For a blocking attempt, Blue has to play on one of the overlapping fields:
If Blue moves at x:
Red is connected by III-2-b.
If Blue moves at y:
Again Red is connected by III-2-b.