Schach und Dame Spiel (Einzelstück, B-Qualität) - chesspoint.ch
White and Black in chess - Wikipedia
Point Count Chess: An Accurate Guide to Winning Chess: Horowitz, I. A., Mott-Smith, Geoffrey, Reshevsky, Samuel, Sloan, Sam: 9784871874694: Amazon.com: Books
Über uns - chesspoint.ch
Beginner to Chess Master #2 The Relative Value of Chess Pieces - YouTube