Mark Lowery and Chess
Provides some interesting basic and fundamental lessons.
Not a bad write-up on **endgames (with advance puzzles under section 2. D), and on tactics/strategy (section 3. A-D).
Has a collection of 3500 problems under the download section (5.C). Most of it is error free.
Cool links under section 10 (i.e. Chess Pieces in 73 languages by Ari Luiro)
Sections are also available in PDF for download.
An additional bonus – this site does not freeze up or hang.
**(with a concise look into the Troitzky lines)