In the folklore of Chess Improvement you often hear about the 300 positions you need to master in order to become a really strong player. GM Alburt has written a nice book
presenting a selection of 300 problems to help you on your path to Greatness. Another book along those lines are IM(?) Ziyatdiniov's "GM-RAM: Essential Grandmaster Chess Knowledge".
I like the approach as it can help the Do-it-yourself improver to find some structure is the search for improvement. Still, the improving player might need some guidance. Dan Heisman has suggested which problems from Alburt's book to study for someone aiming for a rating around 1400.
That is solid advice! This is a first step towards transforming the great material in the book into a stellar pedagogical tool mimicking the novel approach in Silman's "Complete Endgame Course".
Any idea what positions to study to take the next step, say, reaching ELO 1600?
PS. Here is Heisman's suggested problems for the 1400ish target:
5, 15, 18, 26, 27, 39, 63, 68, 75, 80, 82, 105, 109, 118, 125, 128, 129, 133, 163, 203, 206, 238, 242, 247, 265, 280.