Invisible squares and hidden lines!
The previous instalment of The Problemist Diary series dealt with a geometric theme distinctly graphical in nature. But geometry doesn't have to be purely visual, it might as well be conceptual, underlying relationships between squares and lines, and pieces that occupy or move along them. Today's article is also about chessboard geometry but the flavour is bent more towards the strategic and the abstract side of it. This time, the author Satanick Mukhuty, brings you a feast of tactical fantasies based on the well-known clearance theme. Five old and new assorted directmates, all by renowned specialists of the problem art, have been presented with in-depth analyses. So what are you waiting for? Put your thinking caps on and plunge in!