I am a novice who has only picked up my first chess book recently. I want to study some common opening positions, and pick a line to go with & practice for the time being.
While investigating the Sicilian Defense, I notices that many line of the Najdorf system are labeled positional or theoretical. O think I am starting to understand what entails positional, but I still don't get what is meant by theoretical.
What would theoretical mean, in this context?