Problem World by Peter Wong
Introducing the Art of Chess Composition

Problem World
This series of articles on chess problems first appeared as a monthly column on the popular Chessville site, and it is published here in a much revised form. The series aims to introduce the field of chess composition to players, covering its many aspects, and assumes no prior knowledge of the subject. All special terms are explained and for easy reference, the most important ones are linked to their definitions on the Glossary page. Each article contains six high-quality problems (by composers from around the world) that illustrate the topic under discussion, all accompanied by a thorough analysis of their respective solutions.

Note that these articles, and indeed this whole site, follow a chess problem convention in using ā€˜Sā€™ to represent the knight (from the German word, Springer). ā€˜Nā€™ is reserved for a fairy piece called the nightrider.