Problem refers to a situation, condition, or issue that is unresolved or undesired. Usually, the nature of a problem is such that an answer or solution is needed. In such cases, problem solving is used to understand important aspects of the problem so that an answer or solution can be found.
Problems occur in different forms, and can exist in different domains. Examples are provided below.

997 Capture Problems - Free downloadable tesuji collection with verified solutions.
Go Problems - solve go problems interactively through a Java applet; explore variations and contribute problems to the community
Meta Description: [ Interactive go problem database and community. Solve go problems through a Java applet, add new problems, search, comment, and more. ]
Minoru Harada's Tsumego - Elementary and intermediate weekly problems with archive and solutions.
Tsume Go Of The Day - Easier and harder daily problems with solutions.
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