Apparently, whatever you/OP did really worked. How?
Really Frustrated with Endgames

Yes, the OP is now a National Master whereas a lot of the posters telling him what a lazy fool he was are still around 1400.

I don't usually reply when my old posts get bumped. I'll respond to this one since I think I remember around that time my then-coach showed me some annotated games, probably Capa-Tartakower, idk what else. Basically this stuff takes time, you don't *get a feel* for something overnight in chess. There isn't a magic bullet. But if you're 15 and you play a ton of chess and you analyze your games/work on chess outside of just playing, eventually you'll get better.
A lot of people gave me good advice in this thread, a few of them were kinda arrogant but that happens. It's the internet.
I never ended up buying or reading the Shereshevsky book but I have met so many friends who have and were happy with it, so who knows, if I ever decide to try to improve at chess again, maybe that'll be one of the first things on the list.

Also, chess.com does have an endgame tablebase... it's definitely helped me. You can access it from the Analysis page whenever there are seven or fewer pieces left on the board.
https://www.chess.com/news/view/chesscom-announces-new-tablebase-feature
I collected 100 practical endgames with lots of notes and annotations. In pgn format. Download them from the download section. I am building up a database of practical endgames and have found that 90 percent of grandmasters have made mistakes, missing best moves to win or draw, in their own endgames.
That will be helpful! Thank you for the effort.
I think when a GM makes a critical mistake the comparison of mistake plus correction makes the right idea easier to remember.
Since you're a diamond member, go look at IM Danny Rensch's King and Pawn endgame series (6 videos) and his Rook endgame series (11 videos). They are fantastic, and you've already paid for access.