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NameSizeDate Added

Instruction Required

422
It is necessary to read some instruction before solving these problems: trying to solve the problem before reading the introduction will not work. These problems often say things like "if you think you can kill this group, play at A. otherwise play at B."
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Basic Shape

415
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 beforehand.
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Fun

286
Whimsical problems of the kind that you'd never see in a real game, but are fun to solve.
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Semeai / Capturing Race

283
Problems which deal with a liberty filling battle between groups lacking two eyes.
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Connect

252
Try to connect stones.
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Ladder

216
Otherwise known as 'shicho,' ladder problems can be interesting in many different ways. Some are difficult to read due to the configuration of the stones at their end. Some fantastical creations lead to ladders bouncing all over the go board.
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Ko / Ko Threats (secret)

167
Best way to play in a ko, or ways to play to maximize ko threats later.
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Cutting

137
Cut your opponent's stones.
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0 What Group?

110
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 sure the group is at the top of the list, so people can find it more easily.)
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Irregular board

97
Problems on an unusually shaped board.
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Shape

77
Try to make good shape for your stones or bad shape for your opponent's. One of the most important skills in go.
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Seki (secret)

73
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Symmetrical

72
At least one axis of symmetry.
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Counting Points

69
How many points is a move worth? These problems test your counting ability.
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Life on 2nd Line

63
Often one has to find life with stones only on the second line.
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Best move with letting enemy live

53
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". Anytime doing the best is winning for self.
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Strange

41
Problems, jokes, etc. whose solutions are not based on normal go play.
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How Many Ways

37
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 find one way, without examining all the possibilities that may have different effects on the surrounding situation.
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Stories

36
The problems have associated stories.
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Black or White

36
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 kill.
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Timing

32
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 sequence is especially important or the key issue. Rin Kaiho (Lin Haifeng): "Go is about the order of moves". Examples could be YOSU-MIRU moves (probe in a position to see how the partner responds). It will include many examples with correct paths where the end-position is the same as in a wrong solution, but did evolve in another way. Other examples would be positions which are not played out completely, rather stopped at a certain point in order to wait for a better (the best) time to proceed (in ways which can be decided on better later). This is the 2nd aspect of YOSU-MIRU. I would understand the context narrower than given in http://senseis.xmp.net/?Timing.
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Hamete

28
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 will mostly suffer only a small loss
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Nakade (secret)

27
Big dead eye spaces.
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Escape

27
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 other color cannot stop the escaper from collecting more liberties or confine him in any direct way.
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Corner Boxes

26
A perfectly rectangular box in the corner, which may or may not have open edges or enemy stones inside.
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13*13 Games

23
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2-2 Crosscut

19
Problems where there's an obvious 2 - 2 cutting point to start the problem.
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Handicap Game

18
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5x5 Endgames

17
Endgame problems from 5x5 boards.
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CGT

15
Combinatorial game theory is, among other things, about how to get the last point. Sometimes these problems can be solved by standard endgame theory, sometimes not. CGT is described on Sensei's Library.
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Rule Set Dependent (secret)

13
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 Japanese rules.
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Dragons

13
Problems dealing with the life and death of large groups.
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Choose your Difficulty

11
Problems that let the user choose between several paths of resistance of varying difficulty.
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Spiral Ladder

11
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6 Live 6 Die

9
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 unconditional solutions.
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Notch Group

8
2nd line groups with a "notch".
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6x6 Endgames

8
Endgames problems on 6x6 boards.
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Construction

5
Problems that require the solver to construct a position with some given properties.
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yosihiro

5
Problem of yosihiro
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Irregular rules

5
Used useless rules but it's a joke:)
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jingdiansihuo

4
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Shinogi

3
Shinogi is a the art of making shape or eyes for groups in danger.
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Nadare Joseki

2
Avalanche Patterns
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Hiraki (Extension)

2
What is the correct extension?
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Etiquette

2
"problems" related to good manners
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Good and bad style

2
Avoid vulgar style.
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No-Throw-In Corner Tesuji (secret)

1
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.
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