Yamaguchi opening rule

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Yamaguchi opening rule is a renju opening rule. It was developed by Japanese player .

Rule details[]

The sequence of moves implied by the rule follows.

• The first player (tentative black) puts one of the 26 openings and declares how many 5th moves will be offered in that game.
• The next player (tentative white) has a right to swap.
• The white player puts the 4th move anywhere on the board.
• The black player puts as many 5th moves on the board as it was declared before (symmetrical moves not allowed).
• The white player chooses one 5th from these offerings and plays the 6th move.

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.^[1][2]

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.

External links[]

• http://renju.net/media/showrule.php?rule=5 Renju International Federation - description of Yamaguchi rule.
• http://renju.net/organizations/ga2008.php - RIF GA with rule description
• http://www.renjusha.net/8twc_info.html - Team World Championship-2010 organizer's site, Yamaguchi rule mentioned as tournament rule.
• http://renju.net/media/tourninfo.php?tournament_id=545 - Information about World Championship-2009 finals.

References[]