The more I read abotu 2 bath developing the more I am getting confused.

Ok for example. I have a contrasty scene. O am using let say 100 spped film. I go N-1 (iso now 50) and I underdevelop. Take time and substract 20-30%. I think this is for straight developing now 2 bath. Now with tow bath you jsut develop 4 and 4 right?

What if the scene is flat do you puch a bit say N+1 (ISO 200) and add a bit of time to the developing? What abotu in a two bath developer? Still 4 and 4?

I am just trying to get a grasp of this as I never used two bath before.