You can try Starting out defensive play by Angus Dunnington and secrets of chess defense by Mihail Marin. The Starting out is an easy read but if you want something more dense then Secrets of chess defense is the one to study.
Good luck for your match
Hello everyone. I am preparing for my next match coming up in late May or early June. I know my opponent quite well, he is a very aggressive player and prefers blocked positions. He plays the KID and the Pirc and the Spanish as white. I would like to work on my defensive play for this match. What are some of the better defensive books in your opinion. The only defensive book I own is Jacob Aagards book called Practical Chess Defence. Is there some other defensive books I should read before I hit this one as Aagards books I feel like are normally aimed at 2200+ players.