Gomoku Guide 03: Standard Opening Theory & First 5 Moves

1. Core Opening Principle: Seize Central Territory

The absolute highest-value spot on the 15×15 board is the exact center crossing. Stones placed here support line growth across four separate axes, while edge and corner intersections only allow two directional expansions. All competitive opening sequences begin with Black occupying center as move one; any alternative first stone creates an immediate positional disadvantage that White can exploit for the full game.

2. Two Major Black Opening Branches

After the central first stone, Black splits into two standardized opening categories adopted worldwide by amateur and pro players:

• Direct Opening: Second black stone placed adjacent to center, forming a short horizontal or vertical two-stone chain for fast early open three construction. Best for freestyle casual matches with no forbidden move limits.
• Indirect Opening: Second black stone diagonally offset from center, slower expansion that avoids early three-three forbidden traps in Renju tournament play. Safer for competitive rule sets.

3. Safe White Counterplay Responses

As White, your opening goal is to disrupt Black’s unbroken central expansion without creating weak exposed lines of your own. Two reliable second-move responses work against all black openings: diagonal blocking close to center, and offset distant peripheral placement to split Black’s potential cross lines. Avoid placing white stones isolated on far edges in the opening phase, as this abandons central combat entirely.

4. Early Game Mistakes To Avoid In The First Five Moves

1. Black placing first stone on edge or corner, giving up central dominance voluntarily.
2. White ignoring central area to build disconnected two-stone chains on board borders.
3. Stacking all early stones along one single axis with no diagonal expansion potential.
4. Creating careless open three lines that let the opponent form instant double threats on their next turn.