What is weiqi? The 4,000-year-old game behind Go, baduk, and 碁

Weiqi is the oldest board game continuously played in the world. In English we usually call it Go. In Korean it is baduk. In Japanese it is 碁 (igo). In Mandarin it is 圍棋 (wéiqí). The principles have not changed in four thousand years: place stones, surround territory, capture what you can, leave the rest. What has changed is the surface area — the boards we play on, the engines we review against, and the way the rest of the world can now join in.

This post is the introduction a beginner or an interested newcomer needs: where weiqi came from, why so many cultures have a word for it, what it is about, and why it is worth an evening of your time. For the rules themselves, see How to play weiqi. For the philosophy behind openings, see Basic weiqi strategy. For the comparative answer of weiqi vs go in particular, see Weiqi vs Go.

● The names

01

One game, four names

Wéiqí, Go, baduk, 碁 — same board, four thousand years.

The Chinese term wéiqí (圍棋) literally means “encirclement board game.” It is the oldest attested name and the source of the Korean pronunciation baduk (바둑). The Japanese form igo (碁) is a separate native Japanese term — the game had been transmitted to Japan by the 7th century, by which point it was already a thousand years old.

The English name Go arrived via Japan in the 19th and early 20th centuries, when Japanese teachers began exporting the game formally. Go stuck in English because it was the name most Japanese instructors used internationally. Weiqi has been steadily gaining ground in English usage since the late 20th century as Chinese, Korean, and Taiwanese players and scholars insist on the original pronunciation.

All four names denote the same game: a 19×19 grid (most common), two players, alternating placement of black and white stones, capture by total encirclement, scoring by territory plus captures. For more on terminology and how the rules compare across regions, see Weiqi vs Go.

● The history

02

A four-thousand-year arc

From Emperor Yao's tutor to a Kubernetes-deployed AI opponent in 2026.

The earliest attestation of weiqi is in Chinese texts dating to roughly the 11th century BCE, during the late Shang and early Zhou dynasties. The legendary Emperor Yao is credited with inventing the game as a teaching tool for his heir — the chronicle describes Yao’s tutor designing weiqi to train the prince in balance, restraint, and reading the consequences of moves.

For most of its history the game was associated with the imperial court, the military, and the scholar-gentry. The earliest surviving board fragments date to the Spring and Autumn period (770–476 BCE). By the Han dynasty (206 BCE – 220 CE) weiqi had spread into Korea and Japan. By the Tang dynasty (618–907 CE) weiqi was already a fixture of poetry, painting, and diplomatic gift-giving.

The 20th century professionalised the game: in Japan the Honinbo, Meijin, and Kisei titles crystallised in the postwar decades. The 21st century AI revolutionised it: AlphaGo’s 2016 victory over Lee Sedol showed that machine play had surpassed human play in concrete evaluation, and the open-source KataGo engine that followed has since become the de facto training partner for serious players. For more on that arc, see The story of weiqi.

● Why it endures

03

Why weiqi is still worth playing

Rule simplicity, decision depth, and a community that outlasts empires.

The enduring appeal is in the ratio between rules and decisions. The full rulebook fits in a single page — three or four short paragraphs total. The number of distinct legal positions on a 19×19 board exceeds the number of atoms in the observable universe by several orders of magnitude. No move can ever be exhaustively calculated. Every game is a partial read of an essentially infinite space.

That asymmetry is what makes weiqi both approachable and inexhaustible. A child can learn the rules in an afternoon. A lifetime of play does not exhaust the game. The decisions are repeatable and inspectable — each one is a stone placed at a specific intersection, traceable to the moment it was chosen.

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Other games age. Go is the same game it has always been.

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● Why now

04

What changed in 2016, and what is changing in 2026

AlphaGo proved AI is stronger. Sharp.go is what we built on top of that.

Two moments in time changed the surface area of the game for the rest of us.

2016 — AlphaGo vs Lee Sedol. A deep neural network from a small London company defeated the reigning 18-time world champion in a four-games-to-one match. Lee won one game, played under sudden-death conditions. The professional Go community spent the year that followed adapting to the new reality: machine evaluation had exceeded human intuition at the highest levels.

2026 — weiqi becomes browser-first. Open-source engines like KataGo now run on modest hardware and ship in cloud shapes that match on devices. The barrier to playing a calibrated opponent at any time is essentially zero. Sharp.go is a browser-first 3D weiqi client built for this moment — no install, no accounts to play, shareable game URLs, an AI review that actually understands the position. Open the home page and play a game in under a minute.

● Who plays

05

Who plays weiqi today

Roughly fifty million registered competitors, plus a much larger community of players.

Weiqi is played competitively in East Asia, where national federations in China, Japan, Korea, Taiwan, and increasingly Singapore and the Philippines train professionals from childhood. China alone has more than fifteen million registered competitive players; the total worldwide is widely cited as being north of fifty million when informal play is included.

In the West the game has grown steadily. European and American Go associations run weekend tournaments, online leagues, and youth programmes. AI-assisted learning — particularly with open-source engines — has lowered the barrier for adults who want to reach a stable intermediate level. Sharp.go is one of several Western clients targeting this audience.

● How to start

06

What to do next

Three concrete first steps, in order.

If this post has made you curious, the fastest path forward is:

1. Learn the rules. They take about ten minutes. See How to play weiqi.
2. Play a game. Open sharp.go, pick a 9×9 board, and play against the calibrated AI. The first game is the most confusing; the second is much clearer.
3. Solve three life-and-death puzzles a day. This is what intermediate players call tsumego, and it is the single most efficient way to develop the reading skill that underlies every later concept.

Weiqi rewards patience. The first ten games are about learning how the stones move; the next hundred are about learning how to read. Somewhere in there the game starts to feel like the four-thousand-year-old decision problem it actually is.

● Frequently asked questions

01 What is weiqi? ▾

Weiqi (圍棋) is the oldest board game continuously played in the world. Two players take turns placing black and white stones on the intersections of a 19×19 grid. The aim is to surround more territory than your opponent. It is known as Go in English, baduk in Korean, and igo in Japanese.

02 How old is weiqi? ▾

The earliest Chinese texts mentioning weiqi date to roughly the 11th century BCE, during the late Shang dynasty. The game has been played continuously for around four thousand years.

03 Why are there so many names for the same game? ▾

The Chinese pronunciation 圍棋 (wéiqí) is the oldest. Korean adopted a similar word (baduk, 바둑). The Japanese term igo (碁) developed independently after the game reached Japan by the 7th century. The English name *Go* came from Japan during the early 20th-century export of the game, and is now shared with the original *weiqi* in formal usage.

04 Is weiqi harder than chess? ▾

They are different. Weiqi has simpler rules but more possible positions than chess by a factor of roughly 10^170. In chess a finite-search engine can outperform a human; in weiqi, AI only surpassed humans in 2016. For most players the practical question is not which is 'harder' but which rewards the style of thinking you enjoy.

05 Can I play free weiqi online? ▾

Yes. [Sharp.go home](/) hosts a free browser-based 3D weiqi client with a calibrated AI opponent. No install, no account required for a casual game.

For a focused comparison of terminology and history, see Weiqi vs Go. For the full historical arc from Emperor Yao to AI opponents in 2026, see The story of weiqi.