It is necessary to read some instruction before solving these problems: trying to solve the problem before reading the introduction will not work. These prob...

A standard shape, usually found in a corner or side. These will often appear in games; sometimes even out of josekis, and it's important to know the solution...

Whimsical problems of the kind that you'd never see in a real game, but are fun to solve.

Problems which deal with a liberty filling battle between groups lacking two eyes.

Try to connect stones.

Otherwise known as 'shicho,' <a href="http://senseis.xmp.net/?shicho">ladder</a> problems can be interesting in many different ways. Some are difficult to re...

Best way to play in a ko, or ways to play to maximize ko threats later.

Problems on an unusually shaped board.

Cut your opponent's stones.

If you are unsure to what group a problem belongs please add it here and the moderators will index it for you. (The "0" in the name is only there to make su...

At least one axis of symmetry.

Try to make good shape for your stones or bad shape for your opponent's. One of the most important skills in go.

How many points is a move worth? These problems test your counting ability.

Often one has to find life with stones only on the second line.

When one player well do killing enemy's group, then it's happy. But some cases are impossible to kill. But go is not representing only "winning games". Anyti...

Filling Dame is the one of etiquette for go even if Japanese rules are used. It's getting points when chinese rules are used. Some people on this site say it...

Problems, jokes, etc. whose solutions are not based on normal go play.

The problems have associated stories.

These problems ask you not just to kill or live, but how many ways there are to do it. This is good training, because many go players quit as soon as they fi...

Problems where the first move consists of choosing to attack, if the user thinks that he can kill, or choosing to defend, if the user thinks that he cannot k...

Endgame problems from 5x5 boards.

The idea for a concept "Timing" came up when editing problem #3300. Problems can be added into this group, when the question "when" to play a move or sequen...

A perfectly rectangular box in the corner, which may or may not have open edges or enemy stones inside.

Big dead eye spaces.

A hamete is a trick move. If you do not know the correct answer you run the risk of ending up with a very bad position. While if you do know, your opponent w...

The concept of escaping with a group out of the local context, i.e. globally into the center (the contrary would be boshi) or on smaller scale, i.e. the othe...

Endgames problems on 6x6 boards.

Problems where there's an obvious 2 - 2 cutting point to start the problem.

Combinatorial game theory is, among other things, about how to get the last point. Sometimes these problems can be solved by standard endgame theory, someti...

Problems dealing with the life and death of large groups.

Problems that let the user choose between several paths of resistance of varying difficulty.

Problems that depend on the rule set being used or problems that do not use Japanese rules. Please note that unless stating otherwise, this site uses Japane...

Positions from real games where the AI suggestion surprised me

Used useless rules but it's a joke:)

2nd line groups with a "notch".

Here are six groups to save and six to kill, and for an added touch of realism, one problem in each of the six has no solution. The rest all have uncondition...

Groups inside other groups

Problems that require the solver to construct a position with some given properties.

Life on the second line, bending around a corner

Problem of yosihiro

Shinogi is a the art of making shape or eyes for groups in danger.

These problems make pictures or "art" on the board.

What is the correct extension?

Avalanche Patterns

Avoid vulgar style.

"problems" related to good manners

This specific tesuji happens when it looks like a player should throw in a stone in the corner, but actually there's a damezumari when you just atari instead.

A rectangular box on the side of the board