The Motif - IM Gyula Meszaros (K-6397)
"The motif is the effect that a chess piece has towards another (own or opposing) piece, or square" so is the definition by the author in the introduction chapter.
According to Meszaros, motifs fall into two categories: basic or combinational. The elements of both groups can be simple or complex, depending on the number of their components.
Concepts like Potential Attack, Undefended piece or square, X-Ray, Blockade are explained with illustrative examples.