Yamaguchi opening rule

Yamaguchi opening rule is a renju opening rule. It was developed by Japanese player Yusui Yamaguchi.
Rule details.
The sequence of moves implied by the rule follows.
Brief description.
This rule is very close to an old RIF opening rule and therefore favorited. It gives an average variety of new playable variants in a good number of openings, but some of them (13ths and some others) don't become playable. More, this opening rule doesn't protect players from a 11D-draw variants.
Tournaments played by this rule.
This opening rule was official opening rule for Renju World Championships and Renju Team World Championships from 2009 to 2015.