YAMAGUCHI RULE

1. First player puts 3 stones (from 26 openings, like with RIF standard rules), and at the same time, suggests how many alternative 5th moves to be made.


2. Second player decides to swap or keep as white and plays the 4th move.


3. When black plays the 5th move, he/she needs to play as many alternative 5th moves as suggested by tentative black when opening the game.


4. White chooses one of the 5th moves, and plays the 6th move.


5. Continue as RIF standard rules (with forbidden moves rule for black).