Edge template IV1c

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The template:

(From: www.drking.org.uk)

Red has two main threats:

and

using the ziggurat.

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


First attempt:

243561

Red 2 threatens to connect to the bottom on the left side and forces a Blue move like 3. Likewise Red 4 forces 5 or similar moves. In the end 6 is safely connected via 2 or 4.

Second atttempt:

21834657


Now white has three main threads:

132
1

using the ziggurat and

1

where the group containing 1 is connected to the left via one of the spots marked with + and trivially to the bottom.

The overlap in which Blue has to play:

abcdefghijk12345

The 4 different moves are now considered from top left to bottom righ:

Move 1 (g3):

1243

The group containing 4 is now connected to the bottom via the template III-2-b

Move 2 (g4):

4213

The group containing 4 is now connected to the left by one of the threads marked with + and to the bottom via the template IV-2-b

Move 3 (f5):

432615

If Blue plays 3 before 5, Red can play 4 before 6.

Move 4 (g5):

2431

So all Blue blocking attempts fail.