The idea is that the highlights will exhaust the developer and the shadows will keep developing. Compensating development is another name for it
I think it works best in 35mm and MF, in larger formats you can have drag marks.
I like to use Rodianl 1+200 for this method.
Just agitate for the first minute and then go by a pizza, come back in 2-3 hours (time is not so important)