The Norwegian Rat is the popular name for the opening that arises after 1.e4 g6 2.d4 Nf6!?, a line that has been known for decades but never saw any real popularity until Magnus Carlsen started using it in various blitz events. Also Ian Nepomniachtchi, Richard Rapport, and other strong players used it with powerful effect to drag White players out of their comfort zones into Black's domain. In this work, you will find forty-one thoroughly analyzed main games with lots of explanations and additional analysis as well as a 'Quick Repertoire' that will allow you to play the opening in your games after a minimal amount of study time. Series Opening Hacker Files 4. Picture 2 shows contents of the book.