Renju is a professional variant of Gomoku, in which the game is played on a smaller 15×15 board and handicaps the first player (Black) in two ways:
- By forbidding that player to make any of the three restricted moves (Three and Three, Four and Four, and Overlines). The opponent can still use them.
- By using the "swap rule", allowing the opponent to choose whether to swap player positions after some moves are made. This was later changed so that both players must follow a sequence of opening moves (or an "opening rule").
Many digitized adaptations of Gomoku also include Renju rules.
• My Time at Portia features it as a mini-game with the alternate name "Cross-Five"