- E-book1001 Chess Exercises for Club PlayersFrank Erwich
- E-bookTactics Training - Magnus CarlsenFrank Erwich
- E-bookNew In Chess Gameprep Elo 1400-1600Frank Erwich
- E-bookTactics Training - Garry KasparovFrank Erwich
- E-bookTactics Training - Hikaru NakamuraFrank Erwich
- E-bookTactics Training - Judit PolgarFrank Erwich
- E-book1001 Chess Exercises for Advanced Club PlayersFrank Erwich
- E-bookTactics Training - Mikhail TalFrank Erwich
- E-bookTactics Training Paul MorphyFrank Erwich
- E-bookEndgame Tactics Training Magnus CarlsenFrank Erwich
- E-bookNew In Chess Gameprep Elo 2200+Frank Erwich
- E-bookTactics Training – Anatoly KarpovFrank Erwich
- E-bookNew In Chess Gameprep Elo 1600-1800Frank Erwich
- E-bookNew In Chess Gameprep Elo 2000-2200Frank Erwich
- E-bookNew In Chess Gameprep Elo 1800-2000Frank Erwich
- E-bookTactics Training – Jan TimmanFrank Erwich
- E-bookTactics Training Alexander AlekhineFrank Erwich
- E-bookTactics Training - Viswanathan AnandFrank Erwich
- E-bookTactics Training - Fabiano CaruanaFrank Erwich
- E-bookTactics Training – Anish GiriFrank Erwich
- E-bookTactics Training – Veselin TopalovFrank Erwich
- E-bookTactics Training – Sergey KarjakinFrank Erwich