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 :
The choice 2 :
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.
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 all the playable 5-move positions are available.
Taraguchi-N opening rule was accepted by the Renju International Federation 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.