Special Collections are PDF files of specific articles such as "Spotlight on the Openings and Solitaire Chess" that are in chronological order and complete from all the issues. The articles are selectable by name and bookmarked. Spotlight on the openings are bookmarked by the opening name so you can find it instantly instead of searching through 50 years of magazine issues.
Advantages include having every puzzle ever published in the magazines all in one place and all the solitaire chess columns in one file (ready to print).