Play Go Online

What Is Go?

Go is an abstract strategy board game that originated in China more than 4,000 years ago, making it one of the oldest games still played today. Known as Weiqi (围棋) in Chinese, Baduk (바둑) in Korean, and Igo (囲碁) in Japanese, Go is played by millions worldwide and is one of the four classical arts of China.

Two players — Black and White — take turns placing stones on the intersections of a square grid. The goal is to surround more territory (empty intersections) than your opponent while keeping your own groups of stones alive. Despite its simple rules, Go produces extraordinary strategic depth — the number of legal board positions on a 19×19 board exceeds the number of atoms in the observable universe.

Rules of Go

1. Placing stones: Black plays first. Players alternate placing a single stone on any empty intersection. Once placed, stones do not move.
2. Liberties & capture: A stone or connected group of same-colour stones has “liberties” — the empty intersections directly adjacent (orthogonally). When a group’s last liberty is filled by the opponent, the entire group is captured and removed from the board.
3. No suicide: You may not place a stone that would leave your own group with zero liberties, unless doing so captures opponent stones first.
4. Ko rule: You may not make a move that returns the board to the exact position of the previous turn (prevents infinite loops of single-stone captures).
5. Passing & ending the game: A player may pass instead of placing a stone. When both players pass consecutively, the game ends and the board is scored.
6. Scoring (Chinese rules): Each player’s score equals the number of their stones on the board plus the number of empty intersections they surround. White receives 7.5 komi (compensation for going second). The half-point prevents draws.

How to Play Go — Strategy Tips

1. Claim Corners, Then Sides, Then Centre

Corners are the easiest to surround because two edges already serve as natural boundaries. The opening moves in most games claim corner positions before expanding along the sides and eventually into the centre.

2. Keep Your Groups Connected

Connected stones are stronger — they share liberties and are harder to capture. Avoid scattering isolated stones across the board early on. Build solid frameworks and connect your groups when threatened.

3. Give Your Groups Two Eyes

A group with two separate internal “eyes” (enclosed empty points) can never be captured, because the opponent cannot fill both eyes simultaneously. Making two eyes is the key to keeping groups alive.

4. Read Ahead Before Capturing

Before committing stones to an attack, visualise the sequence of moves and counter-moves. A capture attempt that fails wastes stones and hands your opponent influence. Patience and reading ability are Go’s most important skills.

5. Balance Territory and Influence

Solid territory encloses points immediately, while influence (strong outside walls) projects power across the board for future use. The best players balance both, converting influence into territory at the right moment.

Board Sizes

• 9×9: Fast games (10–20 min). Ideal for beginners learning tactics — captures, life & death, and basic territory concepts. Used in many Go schools for students.
• 13×13: Medium games (20–45 min). A bridge between the tactical 9×9 and the strategic 19×19. Opening principles start to matter more, and influence becomes a factor.
• 19×19: The standard professional board. Full-length games (45–90 min or more) with deep strategy, complex life-and-death situations, and opening theory spanning thousands of years.

AI Difficulty Levels

• Easy: Plays random legal moves while avoiding obvious blunders. Perfect for absolute beginners learning the mechanics of stone placement and capture.
• Medium: Uses heuristics — prioritises captures, defends groups in atari (one liberty), extends along edges, and avoids filling its own eyes. A solid training opponent for intermediate players.
• Hard: Employs Monte Carlo evaluation — simulates hundreds of random continuations to estimate the value of each candidate move. A challenging opponent on 9×9 and a respectable one on larger boards.

Go vs Other Strategy Games

• vs Chess: Chess has different piece types that move and capture in unique ways. Go uses identical stones — all complexity emerges from placement. Go’s branching factor (~250 vs ~35) makes it far harder for computers.
• vs Reversi (Othello): Both are stone-placement games, but Reversi flips opponent pieces while Go captures groups by surrounding. Go’s board is larger and its strategy much deeper.
• vs Checkers: Checkers involves moving and jumping pieces. Go stones never move once placed — the strategy is entirely about where to place new stones.
• vs Gomoku: Gomoku is played on a Go board but the goal is simply to get five in a row. Go’s territory-based scoring and capture mechanics create a fundamentally different game.

Frequently Asked Questions

More Strategy & Puzzle Games

If you enjoy Go, try these other free games: