An ancient strategy game for 2 players who try to outwit each other by placing stones on the board to simulate the capturing of territory.

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Small go board history

Does anyone know origin of smaller go boards (9*9,13*13)? When (and where) was first introduced? I looked on Sensei library but didn't find anything about history of go boards.
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Dan levels: difference between amateur and professional? [duplicate]

Is there a difference between amateur and professional dan levels in go? If yes, how are they related?
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First things to learn about semeai?

I would like to learn more about semeai and be able to quickly learn about how to handle the most common situations (determine quickly whether a group is alive, dead, or undetermined). Now, there is ...
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3answers
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4-4 high approach - why is the defensive approach prefered?

In the 4-4 high approach joseki, why would black ever want to play the defensive - left variant? The result of the right variant looks much better! While the left variant leaves monkey jump ...
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1answer
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Go - How does one count territory in these two scenarios? (9x9)

I'm learning to play Go and I was trying to develop a game in java, but I'm still not sure how to count territory in some cases. In the scenario below, which side belongs to White, Top or Bottom? ...
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4-4 high approach joseki question

I have a question about 4-4 high approach joseki. Everything is clear until move 4. I don't know how to respond if black plays C15 instead of the expected C17 (stone number 5). It leads to the ...
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How to apply the ko rule (Go)

I'm having trouble understanding how to apply the ko rule. For instance, in the description in Wikipedia, there is an example where the ko rule can potentially apply. But suppose there were two, or ...
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4-4 high approach joseki incomplete?

I have a problem with the 4-4 high approach joseki - the left variant: In the left variant, black ends the joseki and white can play anywhere else, i.e. has sente. But the position is pretty weak ...
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Is there a site to play go online against a computer?

There are many go servers but all of them seem to be for player-player games. I want to play online against a computer. I found some but it is not an actual go. I was not able to find a real go brain ...
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592 views

Do strong Go players play simuls, like in chess? Do they ever play blindfolded?

Strong chess players will often play a "simul," walking from board to board and making a move on each, taking virtually no time to select their moves, and forcing themselves to keep track of many ...
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122 views

What are good ways to learn to “read” a sequence of moves mentally?

What are good ways to learn to "read" a sequence of moves mentally (i.e. visualize it in one's mind), in Go? Is practicing on a goban useful, or is trying to stick to mentally imagining the moves ...
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145 views

How can I quickly estimate my level in go by playing against a computer/tablet?

I would like to have an idea of my level in go (in kyu). This would for instance help me choose the most appropriate go books to read. I would like to do this through playing against a program—because ...
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135 views

How to count non fully walled territory?

I just started to learn Go. I still have some problems to properly understand how to count territory when the game has finished (by both players passing). For example, if the game ends in the ...
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393 views

How to begin learning Go?

I've been playing a bit with Go and after a few games I do get pretty well the different rules. The game indeed has a very deep strategy and I've read that to get a grip at that strategy, a player ...
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2answers
141 views

Which games are most rewarding to review? [closed]

I play Go online and have by now quite a few sgf's of past games available which I could review. I'm however lazy so I certainly wont review all or even most of them. So which ones can I learn the ...
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652 views

What are examples of Go played on non-flat surfaces, like on a sphere?

I know there was some thought put into how Go looks or feels like if it's not plaey on a flat, rectangular surface, but the surface of a 3-d object like a sphere or a donut. I'm mostly interested in: ...
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4answers
365 views

What happens in Go if you “take back” a ko before making a ko threat?

In Go, there is a potentially repetitive sequence of moves called a "ko." So if your opponent takes a ko from you, you have to make a move elsewhere on the board, called a ko threat, before "taking ...
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4-4 pincer variant - not in joseki dictionary

I am 4K and played against 2K in handicap game (2-stones). The point of B3 was to prevent a double-wing shape for white (along the right and bottom) So W4 pincer leads us into this joseki variant. ...
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3-4 point joseki - wide double-pincer

After a low approach at W2, B3 is a wide pincer. I double-pincered at W4 and then diagonal B5. $$ $$ . . . . . . . . . . . | $$ . . . . . . . . . . . | $$ . . . . . . . . 4 . . | $$ . . . . . . . 5 ...
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163 views

life and death: 2 x 4 in the corner with defects

In a go game (with another 4K) I got a 2 x 4 region in the corner with lots of defects. W1 almost surely will happen. Can White get life or ko? $$Wm1 $$ |------------ $$ | . . . . X . $$ | . . O ...
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254 views

Is this corner dead?

Played a game on KGS. We are both 4K. He was good at life and death, and I am rusty. Was B1 sente? $$ ------------| $$ . X O 2 1 . | $$ X . X O . . | $$ . . X O . . | $$ . . X O O . | $$ . . X X ...
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187 views

How to balance influence vs territorial plays on a 13x13 board?

Most of the answers to "What is a good opening on a 13x13 board?" deal generally with the differences between large and medium boards. I'd like to ask more generally about how I should be thinking on ...
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4answers
276 views

Magic Sword: Peaceful Variation or is Punishment Possible?

In a game earlier today I encountered a deviation from the Magic Sword pattern that I haven't been able to find anywhere. Instead of cutting, White seemed to offer a peaceful trade of influence for ...
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356 views

How does one set up a 1/4 board for GO?

As a beginner, I was handed a full go board. And, somehow figured it out. A beginner friend wants to start "small" and something like 1/4 of the board. Personally, I think that we should start with ...
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Traditional 1-stone handicap before komi

In "traditional" handicap, when there is a ranking difference of 1, black plays first and there is no komi (Sensei's Library uses this term). But if you play without komi anyway, this is no handicap. ...
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259 views

Three-space jump on third line: how to connect?

I've seen that in the diagram below, the two black stones can connect by attaching to the white stone, but I can't work out the sequence. How does black play to connect her stones? $$cm1 $$ . . . . ...
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Is Go played for money?

Playing for money in this meaning would be single games played for some stake, not tournaments with a prize money. Backgammon has a large tradition to be played like, chess a smaller one (I think). I ...
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Corner variation which is not in Josekipedia

$$Bcm1 $$ ------------------- $$ . . . . . . . . . | $$ . . . . . . . . . | $$ . . . . a 0 4 8 . | $$ . . . . . 1 5 6 . | $$ . . . . . . 9 7 . | $$ . . . . . . 2 . . | $$ . . . . . . . . . | $$ . . . ...
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561 views

Computer Go algorithms applied to other games?

Fairly recently, Computer Go programs became able to compete with humans using Monte-Carlo Search trees: A Monte Carlo (MC) go program plays random games and easily evaluates the terminal position ...
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498 views

Online Resources for Go Tutorials on specific topics

It is well-known that learning about Go is a never-ending process. This question is on resources that I believe to be useful in a certain stage of this learning process. In the very beginning, there ...
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629 views

Resources for learning about good shape?

Shape is immensely important in Go, and you can read about the basics anywhere - don't make empty triangles, table and mouth shapes are good, etc. Where can I find more advanced treatments of shape?
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Second line invasion of two-space extension

The two-space extension is a very common pattern and forms a base. I've found lots of material here, and here, and elsewhere on how it cannot be cut and how to defend against various invasions. ...
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How does the full-size board change the game of Go?

My Go board has two playing surfaces, one big and the other small. As a Go beginner, I have been playing on the reduced size board. I assume this is recommended because it makes games shorter, and ...
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309 views

How do I properly place handicap stones?

Handicap games are very common in Go. The weaker player, taking black, gets to place (usually) up to 9 stones on the board, depending on the difference in skill. Both free and fixed placement are ...
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Deviation of 3-3 invasion - how to live/kill?

I know the following is joseki for an approach of the 4-4 stone followed by a 3/3 invasion... $$cm1 A normal 3/3 invasion joseki (incomplete) $$ +---------------------------------------+ $$ | . . . . ...
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A reference of practical tsumego?

There are insanely many tsumego in existence, but many of them are very artificial and would never occur in real games. While any tsumego helps to improve, specifically learning shapes likely to be ...
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Where can I learn the lingo of Go?

I'm only a beginner at Go, but have been reading the questions in the go tag with interest. However, this game seems to have rather more special terminology than most. What do joseki, shimari, ...
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Komoku-Oogeima joseki order variation

In a game my opponent derived from the joseki line I was familiar with. $$W Actual game $$ ------------ $$ -........... $$ -.94........ $$ -.5128O..... $$ -..X36...0,. $$ -...7....... $$ -........... ...
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Chess (and variations) Endgame Complexity

My understanding is that the game of Go with Japanese Ko rules is, like most such games, EXPTIME-Complete, but that ladders are PSPACE-Complete and that Go endgames have been analyzed independently as ...
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Do professional-level Go players memorize a list of endgame positions as part of their training?

As in this question there were two questions, I extract the second question here.
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3answers
664 views

What is the meaning of 'karai' and how is it applied?

A Western insei recently wondered about the term "karai": Japanese players call black 57 "karai", which is a term which I haven't heard used in western go at all! The meaning appears to be ...
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In Go, Why are “High Point” Openings Seldom Seen in Modern Play?

I'm talking about opening with the "high point" of a "shimari, such as the 3-5 or 4-5 point. The disadvantage is that it allows the opponent to enter near the corner, such as the corresponding 3-4 ...
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1answer
100 views

What rules are used in international events

What rules are used during international events like the recent Samsung Cup?
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279 views

What is the best way to respond to this pincer joseki deviation?

Every now and again when I approach a corner, opponent plays 1-space pincer and I jump out, my opponent immediately peeps. This seems like aji keshi and bad shape, but I've been stumped as to how to ...
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2answers
176 views

Honinbo 1970, match 1: Why does white need to play toward the edge here?

People may remember this game from Strategtic Concepts of Go by Nagahara. $$ --------------------------------------- $$|. . . . . . . . . . . . . . . . . . .| $$|. . . 2 . . . . . . . . . . . . . . ...
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What is the Chinese-language equivalent of gobase (main resource for SGF files)?

I would find it hard to believe if someone tried to tell me that there was not such a website, and that people in China relied on gobase. Isn't there a Chinese-language resource for SGF files?
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What are the main results in game theory regarding Go?

What are the main mathematical results concerning Go? Go is a game with simple rules and big game complexity. It is inefficient to apply primitive chess AI methods (such as position brute force and ...
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Strategy for studying professional games?

I recently took A. Dinershtein's Go style test. It was useful to me, as the test is aimed at finding professional players who might think the way you do, for study purposes. It has definitely worked ...
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5answers
438 views

What is a good strategy for engaging children in playing go?

For children what is the youngest age that it makes sense to begin to teach them go? Is it best to start them on a 9x9 board? Will a child that has learned basic algebra be better suited to learn go ...
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Game from 1978: Why does this fuseki position favor black?

$$ --------------------------------------- $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O . . . . . . . . . . . X . . . . | $$ | . . . , O . . . . ...