Taraguchi opening rule

Taraguchi opening rule is a renju opening rule. It was proposed by Yusui Yamaguchi as an advancement of a Tarannikov opening rule and therefore it was named with a combination of these two names. It has an enhancement, Taraguchi-N opening rule. 
Rule details.
The choice 1 (after the 4th move):
The choice 2 (after the 4th move):
Brief description.
This rule offers a good variety of playable variants in the openings that aren't playable by Yamaguchi opening rule like 13D, 13I, 12D, 10D.
On the other hand, this rule limits playable openings to those that don't have five winning fifth moves, so 2D, 2I and some other openings become unavailable. The Taraguchi-N opening rule solves this problem.
Advancement.
Taraguchi-N opening rule is an advancement of Taraguchi opening rule. After the white player puts the 4th move, the black player can put N alternative 5th moves anywhere on the board (instead of the default N=5 in the original Taraguchi rule). 
Compared to the default Taraguchi opening rule, this rule limits playable openings to those which don't have N winning 5th moves. Having N big enough (10 for instance) all the playable 5-move positions are available.
Taraguchi-N opening rule was accepted by the Renju International Federation (RIF) in 2011 in the General Assembly.
Tournaments played by this rule.
This opening rule is official opening rule for Renju World Championship via Correspondence being held in 2012, European Championships since 2010 and some minor international tournaments.