OmniTools

Gomoku (Five in a Row)

Classic 15x15 Gomoku board game with Single Player (Vs AI) and 2-Player modes.

Basis: Standard 15×15 board with a five-in-a-row win condition·2026-08-28 verified·Editorial policy

Before you rely on this

A game for entertainment. Free-style gomoku is known to favour the first player (black), which is why tournaments use Renju rules that forbid certain black moves — the same move can be legal or not depending on which ruleset is in play. AI difficulty adjusts search depth and does not correspond to any official rating.

Tool Overview & Key Purpose

Play classic 15x15 Gomoku (Five in a Row) against intelligent AI or a local friend with Renju rule enforcement.

Step-by-Step Usage Instructions

1STEP 1

Select game mode (VS Smart AI - Easy/Medium/Hard or 2-Player Local).

2STEP 2

Choose stone color (Black goes first, White goes second).

3STEP 3

Click on the grid to place stones and connect 5 in a row to win.

4STEP 4

Use the [Undo] feature to take back moves during practice.

Real-World Scenarios & Practical Cases

3 Practical CasesScenario #1

Strategic Brain Training with AI

Challenge Hard level Minimax AI under official Renju rules to sharpen tactical pattern recognition.

Blocking open-threes early is essential for defense.Scenario #2

2-Player Local Board Game Pass & Play

Play friendly matches with a friend on a single shared screen.

Enforcing Renju rules balances Black's first-move advantage.Scenario #3

Move Retract & Review Practice

Use the Undo feature to step backward and analyze critical defensive mistakes.

Reviewing lost positions accelerates skill improvement.Rules appliedMinimax search algorithm enhanced with Alpha-Beta pruning heuristic evaluation.

Pro Tips & Key Considerations

Under official Renju rules, Black (first player) is forbidden from playing double-three, double-four, or overlines.Creating simultaneous dual threats (e.g. an open three combined with a four) guarantees victory.

Frequently Asked Questions (FAQ)

Sources & References

Renju International Federation — Official Rules Wikipedia — Gomoku Overview

Basis: Standard 15×15 board with a five-in-a-row win condition · 2026-08-28 verified