30. April 2025
Problems of the Day
Added today:
Segoe Tesuji Dictionary, Part 1 - 4 problems
119
120
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122
Most popular today:
Life & Death - Elementary - 22
22
Segoe Tesuji Dictionary, Part 1 - 4 problems
Most popular today:
Life & Death - Elementary - 22
New Collection: Invasion Hero | 24.03.2024
An invasion is a play made inside an enemy extension or framework with the intention of living, escaping, or sacrificing. By living or escaping, the invader denies the opponent of large territory and may create weak groups for the opponent. Invasions occur throughout the game. In the opening they are probably part of a joseki. In the middle game, they may be joseki, follow-ups or just as likely occur as one player exerts the power of influence built up in an earlier fight. In the endgame they can be considered as gouging tactics. This collection teaches the best ways to start and continue invasions in the early- and middle game.
New Collection: The L Group | 12.03.2024
Basic knowledge of the L group to boost double digit kyu player's confidence ! A diligent study is worth it. The L group is a corner shape that
will appear again and again in your game.
New Collection: Fuseki Hero | 19.02.2024
Fuseki is the whole board opening in the game of Go. It is the phase where both players make their initial claims to the territory on the board. Typically,
an opening can last 30-60 moves, after which the board has been divided into several zones where each player hopes to make territory.
This collection teaches the most common principles about the early phase of the game. The focus is on common principles, but AI answers are also considered correct.
New Collection: Weiqi Life&Death Drills | 05.02.2025
A game of go is a life-and-death struggle, with attacking and defending from beginning to end. The ability to kill and make life is the most fundamental manifestation
of a go player's strength. The training questions provided in this collection are designed to help go enthusiasts learn how to kill their opponents with techniques such
as enclosing, surrounding, placement, under the stones, as well as survival skills like increasing eyespace, connecting and sacrificing.
New Collection: Segoe Tesuji Dictionary | 22.01.2025
Segoe Tesuji Dictionary is a three volume tesuji problem book-set, written by Segoe Kensaku and Go Seigen.
It is divided into sections according to the kind of move needed for the tesuji (e.g., tsuke or geta).
New Collection: Attack Hero | 30.12.2024
In the game of Go, attacks can be used to get an advantage on the board. When attacking a group, killing is not the first objective.
Instead of that a group can be attacked to gain influence, gain territory, stabilize their own group, create thickness or many other reasons.
This collection teaches the best ways to attack groups to get an advantage on the board.
New Collection: Igo Hatsuyoron | 13.12.2024
Igo Hatsuyoron (literally: Production of Yang in the Game of Go) is a collection of 183 go problems mostly
life and death problems, compiled in 1713 by the Japanese go master Inoue Dosetsu Inseki. The problems in this collection
have a very high difficulty, so discussion of solutions might not always be possible.
New: Diabolical - the whole book | 19.08.2024
Today we start publishing all problems from the Diabolical Vol. 1 book. That is 100 boards with each containing 4 or more problems.
Props to posetcay for adding the missing solutions and greetings to David Mitchell, who is the author and also a friend of the website
for several years.
PDFs and more books by him and his association can be found here:
australiango.asn.au/aga-books
New Collection: Direction of the Play | 28.07.2024
This collection covers full board positions, mostly from professional games.
The task is to choose the best move from the given options. The problems were checked with AI for correctness.
New Collection: Techniques of TsumeGo | 04.07.2024
In the game of Go, to solve crucial situations, one has to master the different techniques that the game presents. Those techniques,
also known as Tesuji, are presented in this collection.
The first topics and the first Tesuji techniques to master are ladders (Shicho) and nets (Geta).
Kageyama says "If you want to capture stones, hold up two fingers and say to yourself: 'Can I capture with the net?' and 'Can I capture with the ladder?'"
Kageyama says "If you want to capture stones, hold up two fingers and say to yourself: 'Can I capture with the net?' and 'Can I capture with the ladder?'"
New Collection: Kano Yoshinori | 31.12.2023
This series written by Kano Yoshinori in 1985 covers a large range of fundamental topics.
Volume 1 contains problems about recognizing atari, ladders, snapbacks and basic life and death problems. Created for Tsumego Hero by Stepan Trubitsin.
New Collection: 9x9 Endgame Problems
There's a saying in Go that your overall strength is limited by your endgame strength. Even if you are leading a lot in the opening and middle game, mistakes in endgame can still lose you the game. This collection allows you to practice and level-up your endgame in a small 9x9 board with real-game examples.
New Collection: Sacrifical Tsumego
Sometimes sacrifices are necessary in order to kill, but how many stones can you sacrifice before killing?
That's the question this collection aims to answer.
New Collection: Yi Kuo
Yi Kuo is a classical kifu and tsumego book written by Huang Longshi (1651-1700). It was posthumously published in 1710.
Go Seigen once commented that Longshi's fighting skill
was of 13-dan strength. The problems in this collection are focused mainly on endgame tesujis.
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Update 29.11.2024
Customizable collection index page
The collection index page got a makeover, which makes use of the newly introduced tags. You can set filters for three categories: Topics, Difficulty and Tags.
Further, there are two grouping parameters: Collection types and collection sizes. The type is set to one of the three filters.
In this example, the type is difficulty, which groups the problems in collections for the rank.
The applied filters remain set on the problem pages until they are changed or removed.
The collection index page got a makeover, which makes use of the newly introduced tags. You can set filters for three categories: Topics, Difficulty and Tags.
Update 26.10.2024
Tags, proposals and rewards
We need your help! The problems on this website are currently uncategorized, which we should change. The goal is to assign matching tags to every problem. All users that have passed level 40 or 6k are welcome to help with this meaningful task. There are amazing rewards for those who help with adding and creating tags and/or proposals. So the next time you see a problem, for example, with a Seki, a Snapback or an Under the Stones tesuji, leave a tag.
It is now also possible to make proposals for improving the problem files. You select "Make Proposal", modify the move tree and save. An
admin is going to check and approve the changes. For getting rewards, a point system has been implemented: Add tag (1 pt), create new tag (3 pts),
make proposal (5 pts). Any contribution has to be accepted by an admin to become public. Rewards have been deactivated as they were meant for the early
phase of tags to get it running.
We need your help! The problems on this website are currently uncategorized, which we should change. The goal is to assign matching tags to every problem. All users that have passed level 40 or 6k are welcome to help with this meaningful task. There are amazing rewards for those who help with adding and creating tags and/or proposals. So the next time you see a problem, for example, with a Seki, a Snapback or an Under the Stones tesuji, leave a tag.
Update 13.10.2024
Account management
• Longer sessions.
• Sign in with Google account.
• Option to delete all account related data.
• Longer sessions.
• Sign in with Google account.
• Option to delete all account related data.
Bugfix 01.05.2024
Longer sessions were not working properly, so this feature is reverted. If there are still any issues, such as log-outs, try to delete the cookies.
Update 30.04.2024
Improved search, ratings and board views
• Boards can be roatated.
• Broader rank system: While the last update enabled ranks from 21k to 9d, this update scales the existing problems into the new range.
• Improved raitng calculation: The Tsumego rating calculation added an activity value that is meant to have a higher variance with fresh problems.
• Improved similar problem search: The search has been improved by storing solution types in the database. It always finds many similar problems in any search now and is very fast.
Example: Life & Death - Elementary 745
In this example, it finds 30 similar problems almost instantly.
• Boards can be roatated.
• Broader rank system: While the last update enabled ranks from 21k to 9d, this update scales the existing problems into the new range.
• Improved raitng calculation: The Tsumego rating calculation added an activity value that is meant to have a higher variance with fresh problems.
• Improved similar problem search: The search has been improved by storing solution types in the database. It always finds many similar problems in any search now and is very fast.
Example: Life & Death - Elementary 745
In this example, it finds 30 similar problems almost instantly.
Update 03.04.2024
Improvements of rank display and score mechanics
• Broader rank system: Player and Tsumego ranks range from 21k to 9d.
• Collection difficulty: Instead of a difficulty value from 1 to 9, the average kyu/dan rank is shown.
• Mode-indepentent scores: Problems in rating- and time mode give also xp and they change the problem's status to solved on succeeding. This means that rating and level are affected in any mode.
• Progress bar switch: The progress bar can display any type and it can be switched on the problem pages by selecting the lower left corner.
• Broader rank system: Player and Tsumego ranks range from 21k to 9d.
• Collection difficulty: Instead of a difficulty value from 1 to 9, the average kyu/dan rank is shown.
• Mode-indepentent scores: Problems in rating- and time mode give also xp and they change the problem's status to solved on succeeding. This means that rating and level are affected in any mode.
• Progress bar switch: The progress bar can display any type and it can be switched on the problem pages by selecting the lower left corner.
17.03.2024
Prizes
Madec, Kimok and YuriyStepanovich win a premium account as they have the highest non-premium ratings.
Madec, Kimok and YuriyStepanovich win a premium account as they have the highest non-premium ratings.
10.03.2024
Prizes
GoTalk, Futsal and Imaim win a premium account. One more time we upgrade 3 accounts on 17.03.2024.
GoTalk, Futsal and Imaim win a premium account. One more time we upgrade 3 accounts on 17.03.2024.
03.03.2024
Prizes
Rippa, au61413080900 and franp9am win a premium account as they have the highest non-premium ratings. On 10.03.2024 we give away 3 more.
Rippa, au61413080900 and franp9am win a premium account as they have the highest non-premium ratings. On 10.03.2024 we give away 3 more.
Update 25.02.2024
Overall rating
• Level mode problems affect level and user rating.
• Rating mode is the same as before, but all formulas for user and tsumego rating calculation have been improved.
• Time mode also affects the user rating.
Rewards: Every Sunday, the 3 highest rated users that have no premium account get a premium upgrade. Next prize giving: 03.03.24. To give everyone a fresh start, all user ratings have been reset.
Profile page
The profile page contains more data and is organized in line and bar charts.
Progress bar in level mode:
Show level
Show rating (new)
With this update, Tsumego attempts in any mode affect the user rating.Show level
Show rating (new)
• Level mode problems affect level and user rating.
• Rating mode is the same as before, but all formulas for user and tsumego rating calculation have been improved.
• Time mode also affects the user rating.
Rewards: Every Sunday, the 3 highest rated users that have no premium account get a premium upgrade. Next prize giving: 03.03.24. To give everyone a fresh start, all user ratings have been reset.
Profile page
The profile page contains more data and is organized in line and bar charts.
Update 01.02.2024
Explanation for the duplicate update on 01.02.2024
We decided to merge the duplicate problems on the website. This means, that when you solve a problem and it has duplicates, it is also solved in other collections. When you had a collection complete and there were unsolved problems again on 1. February, it means that duplicates were merged and you need to solve it again for all occurences of that board position.
We decided to merge the duplicate problems on the website. This means, that when you solve a problem and it has duplicates, it is also solved in other collections. When you had a collection complete and there were unsolved problems again on 1. February, it means that duplicates were merged and you need to solve it again for all occurences of that board position.
Update 11.01.2024
Similar problem search
This update contains a search function that can be used on the problem pages. It searches for problems that are similar to the currently visited problem. A parameter can be set for the maximum difference in stones that are placed on the board.
This update contains a search function that can be used on the problem pages. It searches for problems that are similar to the currently visited problem. A parameter can be set for the maximum difference in stones that are placed on the board.
Update 28.12.2023
Board previews and more achievements
It is now possible to see previews of the problems. A preview is shown when you move your mouse over a problem. There are also 23 new achievements.
It is now possible to see previews of the problems. A preview is shown when you move your mouse over a problem. There are also 23 new achievements.
Update 23.11.2023
Dark Theme
Update 06.11.2023
More achievements
The achievements have been stocked up to 91 and there is now an achievement highscore.
The achievements have been stocked up to 91 and there is now an achievement highscore.
| View Achievements | Achievement Highscore |
Update 27.10.2023
Achievements!
With today's update, you can hunt for achievements. Achievements give additional XP. There will be a user ranking and possibly other rewards. This update contains the first 46 achievements of many more.
View Achievements
With today's update, you can hunt for achievements. Achievements give additional XP. There will be a user ranking and possibly other rewards. This update contains the first 46 achievements of many more.
View Achievements
Update 14.10.2023
Improved comments
• Link position in comments: It is now possible to link board positions by clicking "Link current position".
The position can be accessed by selecting the icon in the comment.
• Dynamic coordinates: The coordinates written in the comments adjust according to the visible board area.
Example: 1000 Weiqi problems - 58
• Link position in comments: It is now possible to link board positions by clicking "Link current position".
The position can be accessed by selecting the icon in the comment.
• Dynamic coordinates: The coordinates written in the comments adjust according to the visible board area.
Example: 1000 Weiqi problems - 58
Update 20.07.2023
New board viewer: BesoGo
We changed the technology that is used to display the problems from jGoBoard to BesoGo. There are various advantages, such as a tree display in the review, changing views without refresh, editing and saving problems on the website and more. It also opens possibilities to merge recurring board positions and to make a better result distinction. Instead of correct and incorrect, a future update is going to include more details.
It comes with a separate editor which was the starting point to make this possible. Editor
We changed the technology that is used to display the problems from jGoBoard to BesoGo. There are various advantages, such as a tree display in the review, changing views without refresh, editing and saving problems on the website and more. It also opens possibilities to merge recurring board positions and to make a better result distinction. Instead of correct and incorrect, a future update is going to include more details.
It comes with a separate editor which was the starting point to make this possible. Editor
