Soosorv opening rule

Soosõrv opening rule is a renju opening rule. It was developed by Estonian player Ants Soosõrv.

Rule details

The sequence of moves implied by the rule follows.

• The first player puts one of the 26 openings.
• The other player has the right to swap.
• The white player puts the 4th move anywhere on board and declares whether there will be 1, 2, 3 or 4 fifth moves offered in the game.
• The other player has a right to swap.
• The black player puts as many 5th moves on the board as it was declared before.The fifth moves can not be symmetrical.
• The white player chooses one 5th from these offerings and plays the 6th move.

Brief description

This rule gives an average variety of new playable variants in a good number of openings, especially white-oriented, but openings that are very strong for black (like 2D, 2I, 4I, 7I, 4D etc.) don't become playable. To solve this problem the Soosõrv-N advancement was proposed and certified by RIF.

Tournaments played by this rule

This opening rule was an official opening rule for Renju European Championship in 2008 and a couple of minor international tournaments.

External links

• http://renju.net/media/showrule.php?rule=10 Renju International Federation - description of Soosõrv rule.
• http://renju.net/media/tournaments.php - list of recent tournaments played by Soosõrv (Soosyrv) opening rule.