Herman Grooten
Chess strategy for club players
Attacking Chess for Club Players
Chess Endgames for Club Players
Key Concepts of Chess - Volume 1 - the Hedgehog
Sleutelconcepten in Het Middenspel - Volume 1 - de Egel
Sleutelconcepten in Het Middenspel Deel 2
Understanding Before Moving - Volume 1 - Revised and Extended Second Edition
Understanding Before Moving 2 - Queen's Gambit Structures
Understanding Before Moving 3 - Part 2
Understanding Before Moving 3 - Sicilian Structures - Part 1