I am Regis Warisse, author of chess exercise books.
My 4 digital books in PDF format of 1000 chess exercises: special mate in x moves are now available for free download, for free and legally :
http://www.1000exercices.info/books/
4 exercise books to learn and refine chess tactics.
* 500 chess exercises: Special Mate in 1 move
* 1000 chess exercises: Special Mate in 2 moves
* 1000 chess exercises: Special Mate in 2 moves - Volume 2
* 1000 exercises and chess puzzles: Mate in 1, 2, 3 and 4 moves
A good way to progress for endgame and midgame capture.
Good exercises for everyone
Feel free to share!