KeyConceptsofChess - PawnStructuresVol. 1, DVD-ROM - Software Herman Groo...Key Concepts of Chess - Pawn Structures Vol. 1, DVD-ROM - Software Herman Grooten: Key Concepts of Chess - Pawn Structures Vol. 1Open-, Half-Open Files and The Pawn Chain In this series it's all about strategy for club players, explained in a simple...mehr