Edge template IV3a

The template:



If the middle red piece is removed, the template stays valid, as long as the two remaining stones are connected in some other way.

(From: www.drking.org.uk) Red has two main threats:

 and

 For trying to block the connection Blue has to play on the overlap:



First attempt (c2):



Red 4 is connected to the top by the two fields marked with +.

Second attempt (b4):

