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From the point of view of a computer, everybody sucks at endgame, even GM, so don't get too sad when you look at analysis.
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Some patterns are absolutely essential. I would highly recommend Anna Rudolf's chess.com video on endgames. However, the advanced fancy ones are useless. Keep in mind that they are developed and analyzed by super-gm, for super-gm, and by bored geniuses who like to have fun with theoretical problems. I learned what the Philidor position is and trained it. In my 10,000+ games on chess.com, I think it came out once…
from 1200 to 2100 on chess.com: some pieces of advice and anecdotes

Wow, wow, wow... Now this is a great piece of advice! I agree with most of the aspects you mentioned. Your explanation of openings and how to learn them and what not to do is very good, maybe a little too long ;)
There are two important points that are very important as players are getting better and that should be stressed:
1. ) I would like to point out how crucial a deeper understanding of strategy becomes. So you need to know a couple of moves in the opening, but then you're on your own. And this is where you need to develop positional understanding. Get a good book on chess strategy (for YOUR rating level!) I like the ones from Yusupov, but currently I'm working on Silman's How to reassess your chess together with a friend.
2.) I agree that theoretical rook endgames are not common on lower levels, but knowing some theoretical positions has already won me some games or saved a point. Knowing them is not useless. This should go hand in hand with endgame strategy. Watching endgames of the great masters like Capablanca or Rubinstein helps a lot. There are also some good books on endgame strategy like the modern classic by Shereshevsky.

@Propeshka, I clearly overwrote above, no excuses
On your two points:
1) I wholeheartedly agree. Learning some sharp line may be important, but understanding the strategy of the middlegame that naturally follow your openings is key. I am curious, though, how do you find a book that is adapted for your level? When I tried to do so, I always seem to either come across stuff for masters or for ultra beginners... By the way, would you recommend the Sliman one?
2.) Endgames are one of my strong points. Against people of my elo, I tend to win drawish positions and draw lost positions without learning hardcore theory. But to be fair, I did went over Sliman's complete endgame once when I was 1800, and it helped me, even though I don't remember any precise hardcore complex techniques. My point is not so much against studying endgame, as much as it s against learning it as one would an opening. And again, it's my experience, if somebody tells me that learning the Philidor helped him gaining elo, I'll believe him.

I am curious, though, how do you find a book that is adapted for your level? When I tried to do so, I always seem to either come across stuff for masters or for ultra beginners... By the way, would you recommend the Sliman one?
I'd definitely recommend the Silman one. The book is written for a wide range of club level players, but not for masters. People often criticize his "casual" style, many anecdotes and so on. But I don't mind. It's fun to read and it makes me smile, so I have fun studying chess.
There are exercises after each section (like in his endgame course), and the exercises vary in difficulty. For example, he gives a position and in the solutions afterwards says something along the lines of "as a 1400 player, you should be able to find the first move and see why the alternatives are worse. As a 1600, you should be able to make a plan connected with the chosen move. And as a 2000, you should make a plan, see the possible counterplay for the opponent and prevent it." There are so many examples and exercises with good explanations, I think it's impossible to not learn something, no matter what your rating is.
Another book I like is John Nunn's Understanding Chess Middlegames. 100 middlegame topics are dicussed, pawn structures, attacking and defending, piece play, pawn play... Nunn's style is more scientific than Silman's, but nonetheless it's great.
If you got to 2100 on this site without studying much strategy, kudos to you! This is probably an area that could give you the next boost in chess understanding (and, hopefully, rating). By the way, do you play real OTB games/tournaments?

@Propeshka sold on the Sliman book! I'll definitively give it a try.
My feeling was that it was time to sharpen a few of my opening lines. But I am sure a bit of strategy can only help, especially if it's as good as you described it. I did study a bit of strategy but really not much. The only course I did that focused on was a ChessBase class from Pert: "Typical mistakes by 1800-2000 players," which I could easily recommend.
I played in a tournament once but dropped in the middle. It was fun, but I didn't like having to commit to X-hours of chess so much in advance. I like playing when I feel like it, and 4-6h commitments from time to time were a bit interfering with my work. The main thing I took away from this experience was that my chess.com rating translated quite well into OTB. I was 1900 at the time and beat a 1950 but lost against a 2100.
@PRWoodpusher & @QueenofCali, very happy if my small anecdotes can help!

armand thanks. i would like your advice on learning strategies. i am a beginner never having played seriously until i signed up here. thanks especially for the tip, adjusting the elo range of whom to play.

@acorn1954
From what you say, I assume you are me 4 years ago --> you know how the pieces move, how to mate, and that's basically it.
I don't think you need too much at this stage, and you can probably find it all in a single book: My System by Nimzowitch. It's a great one for two reasons:
a) it's an important historical book, so it's cool to connect yourself to chess history (admittedly a bit gloomy when he uses martial metaphor between two world wars).
b) it has all the critical opening principles you need (without learning any line) to guess the right move at the start. But it also has a lot of the important concepts you need for the middle game.
Suppose you don't want to spend the time reading a full book. In that case, I'll recommend you google the following concepts (in no particular orders) and be sure you understand the strategic importance of each of them. Perhaps you can find a video on each, or just some cool article:
a) knight outposts
b) open and semi-open file
c) open game vs close game.
d) passed pawn and protected passed pawn
e) bishop pair (and why it is valuable)
d) development (both what it is and why it is important)
f) tempo/tempi gains and losses (again why important, obviously linked to point d)
g) when to exchange and when not to exchange (This one is quite complex and can't be summed up in one video, but you should get some basic concepts
h) backward pawns
i) second rank infiltrations (with rooks)
j) piece activity
k) king safety
That should be enough to get you started. If you understand something about each of those points, you should be all set until you reach at least 1800 elo. Once you progress a bit, you should re-look at each of those to see how you understood them better, but you can also start looking at:
i) pawn majorities/minorities
ii) initiative
iii) color weaknesses (when you lose a bishop and can't defend the light or dark square, for example)
iv) taking advantage of a king stuck in the center
v) pawn breaks.
vi) locking out the positions
vii) improving the weakest piece
viii) removing the opponent best piece (and more importantly, understanding which one is the best piece)
ix) activity
x) game rhythm (when to take your time to improve the position and when to strike with very precise moves)
xi) advanced pawn structure linked to your opening repertoire.
xii) managing space
I am sure I forget a few, but conceptually I think you have more than enough here to get you started. Of course, as pointed out, all of this only makes sense if you drill your tactics.
Edit: seeing my posted message, I realized I wrote "you don't need much" and then proceeded to write down two 11 points lists... You definitively don't need to understand all of this before you play, even if improving is very important to you. In fact, I would highly recommend you space out the readings and play games/solve tactics in between to let the concepts sink in.
I wrote what I hope is an exhaustive and useful roadmap, but it shouldn't be scary. Just pick a few topics from time to time, read on them, and keep playing/having fun, and I'll bet good money that you'll improve quickly.

@Propeshka, I clearly overwrote above, no excuses
On your two points:
1) I wholeheartedly agree. Learning some sharp line may be important, but understanding the strategy of the middlegame that naturally follow your openings is key. I am curious, though, how do you find a book that is adapted for your level? When I tried to do so, I always seem to either come across stuff for masters or for ultra beginners... By the way, would you recommend the Sliman one?
2.) Endgames are one of my strong points. Against people of my elo, I tend to win drawish positions and draw lost positions without learning hardcore theory. But to be fair, I did went over Sliman's complete endgame once when I was 1800, and it helped me, even though I don't remember any precise hardcore complex techniques. My point is not so much against studying endgame, as much as it s against learning it as one would an opening. And again, it's my experience, if somebody tells me that learning the Philidor helped him gaining elo, I'll believe him.
First of all, congratulations on your milestone.
I've read your first post, I generally agree on most stuff you've said (at least up to my rating level, but the rest seems logical to me as well, and I have similar opinions on what you've written).
As for Philidor position and such things... You don't have to get it directly in your game to profit from it. I had some games where I could beforehand see if when I trade down I would get the endgame I wanted or not. In that sense knowing those positions can hel you out. It can help you make a decision moves before getting to those type of endgames.
For instance, I had several games with opposite color bishops, so knowing that those endgames can be drawn in many cases helped me draw some games where I was worse.
I am as well better (for my own level at least) in having solid structures and not allowing weaknesses (along with endgame play) than at tactical play and attacking (I can be successful at it when the opponent lags in development or is passive however, but in opposite side castling and races situations I tend to score worse).
For that reason not only that I am playing e4, but I am playing Najdorf against e4 as black when allowed. I would probably be more successful in either Caro Kann or Scandinavian for instance, but I feel if I get enough experience in sharp opening like Najdorf, I would get better at it at certain point in time.
I enjoy longer games like 1 hour per side and 45|45, but it is not easy to find opponents at 1 600 level and over at those time controls, so I joined clubs that organize tournaments for 45|45 and 30|30 games. There are some higher rated players playing those from time to time. So such clubs might be useful for those who like longer games.
I play 30|0 from time to time when I can't find longer games with opponents around my level, especially when I see some 2 000+ rated players. I feel that I should play 15|10 and 30|0 more in the future if I want to increase my rating and play some higher rated opponents but I just like these longer games, 15|10 and I already feel I am playing worse than usual. But I will probably get to it sometimes. Especially as there are talks that there will be a new rating category for longer games and rapid will not be such a broad pool as it is now.

@nklristic I fully agree with your point, of course. Knowing these lines will help, not because you get them but because you can make strategic decisions to avoid them or try to get them.
However, even with that in mind, I don't think it helped me often enough to justify the learning experience (so far). That, of course, doesn't mean one shouldn't learn them, but perhaps it should be near the bottom of the todo list (again, at least from my experience).
Especially because these patterns are so damn hard to remember, precisely because you never practice them. Especially if you compare them to something simple like a smothered mate. I played it three times in all my games, but it often was a possibility in some lines, and going for it helped me gain the advantages many times.
I also wrote this point because I often hear the opposite advice: "learning these complex endgame patterns is crucial to chess success." I am willing to concede that it may be helpful sometimes, but I am adamant that it's not a must.
A for online clubs and longer games, that's a very cool idea. I never seriously joined an online club, and that's definitively something on my todo list. I must say none appealed to me so far on an aesthetic basis (a stupid reason, I admit it). I especially like the idea of playing the same player more often to perhaps drill more some variation of opening that one guy likes to play. Anyway, If you have an online club recommendation, let me know!
@DaBabysBurner, thanks a lot!

@nklristic I fully agree with your point, of course. Knowing these lines will help, not because you get them but because you can make strategic decisions to avoid them or try to get them.
However, even with that in mind, I don't think it helped me often enough to justify the learning experience (so far). That, of course, doesn't mean one shouldn't learn them, but perhaps it should be near the bottom of the todo list (again, at least from my experience).
Especially because these patterns are so damn hard to remember, precisely because you never practice them. Especially if you compare them to something simple like a smothered mate. I played it three times in all my games, but it often was a possibility in some lines, and going for it helped me gain the advantages many times.
I also wrote this point because I often hear the opposite advice: "learning these complex endgame patterns is crucial to chess success." I am willing to concede that it may be helpful sometimes, but I am adamant that it's not a must.
A for online clubs and longer games, that's a very cool idea. I never seriously joined an online club, and that's definitively something on my todo list. I must say none appealed to me so far on an aesthetic basis (a stupid reason, I admit it). I especially like the idea of playing the same player more often to perhaps drill more some variation of opening that one guy likes to play. Anyway, If you have an online club recommendation, let me know!
@DaBabysBurner, thanks a lot!
In any case, I suspect (I could be wrong of course) when you probably go through some theoretical endgames, even if they don't appear, you might gain some general knowledge that you can use without even noticing it.
As for analysis well, because I play longer games, I feel that in most cases I do some form of self analysis while playing when I consider my next move, so I have to admit that in most cases after I play a game, I as well generally just turn on the engine and wtrite some thoughts and check out why something is a bad move and so on.
I use analysis tool here for fun, but because it is just depth 18, for real analysis I use a freeware pgn Chessbook that has integrated Stockfish in it. Of course it can't compete with Chessbase.

Thank you very much for sharing this with us! I enjoyed reading it. Im wondering have you considered the idea of making a blog?

Definitively tempting on the blog, I like to write and to play chess. I guess because so many players are soooo much better than me, I felt not legit enough to write a blog.
But I guess it may be cool to have the perspective of someone improving and who is still playing chess as a hobby and not a career.
I'll consider it