Edge template IV1a
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(Redirected from Defending against intrusions in template 1-IVa)
Template IV1-a is a 4th row edge template with one stone.
Defending the template
Red has at least two threats involving the ziggurat:
Red also has a threat involving edge template III1b:
Since there is no hex in the overlap of all 3 threats, Blue cannot block Red's connection.
