Quote Originally Posted by kiemchacsu View Post

Given that i have rated 1600 for tri-x and want to develop in D-76, Which dilution should i use to obtain the best shadow details among 1+1; 1+3 and STOCK?

Thanks for your advice!
1+3 is better. To gain shadow detail you need to develop longer, but since shadows develop slower it also takes less out of the developer in shadows, so higher dilution (lower activity) makes sense, because it helps keep the highlights in check because of that lower activity.
Since you develop longer you still get good highlights. The goal here is still to develop for the highlights, but the higher dilution and longer development time helps your shadows a bit.