Edge template IV3a

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Template IV3-a is a 4th row edge template with 3 stones:

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

(From: www.drking.org.uk)

Defending the template

Red has two main threats:

A

and

B

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

xy

If Blue plays at x:

1423

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

If Blue plays at y:

256314