8th World Chess Composing Tournament of the FIDE
Questions and Answers 10
Section F (selfmates)
Are virtual lines considered thematic?
For example: In the 1st black move, a white piece is captured. After this
capture, a white line-piece can NOT move onto a square which is located (either
orthogonally or diagonally) behind the black thematic piece, because after
a 2nd move of this black piece, a line would be emerging which would cause
Reply: Yes, "virtual" lines of this kind are considered thematic.