Unless stated otherwise, all material authored by me is licensed under the GPL version 2 or greater (your choice), or the Attribution-ShareAlike Creative Commons license.

• lessons by I. Epshteyn
• endgame columns by N. Elkies
• Chess problems by Christoph Bandelow.
  1. Problem 1 (retrograde)
  2. Problem 2 (mate in 8)
  3. Problem 3 (mate in 6)
• Chess problems by Karl Fabel .
  1. Problem 1 (mate in 182 moves)
  2. Problem 2 (not mate in 1)
• Mathematics and chess
• chess game viewer (a google engine django app)
• Free online chess database.
• University of Pittsburg's chess archives
• fen2html converter (in Python)