Either I lose in the opening or I win the game. Only by memorizing tons of opening moves have I been able to rise from 1300 to 1700. It's not possible to get over 1500 without pretty much knowledge about openings. Probably, you have known so much about openings that other parts of the game have been what has kept you down.
HEY NOOBS! Forget Openings, Study Tactics (The right way)
Either I lose in the opening or I win the game. Only by memorizing tons of opening moves have I been able to rise from 1300 to 1700. It's not possible to get over 1500 without pretty much knowledge about openings. Probably, you have known so much about openings that other parts of the game have been what has kept you down.
The text editor in this sucks. I can't figure out how to change the area quoted. So the areas before, "Monster_Melons wrote:" where it still quotes is just regular and the text editor from chess.com isn't very intuitive. And those quotes are just me typing what I can.

Looks like the confusion (or disagreement) is about words and phrases only. You need to know where to put your pieces in the opening. Most people call it opening theory. You seem to call it ideas instead of theory, or something like that. I'm not talking about knowing exactly each and every half move, but to know how to organize your own pieces. They have their known places, like bishop on g2.

I have to disagree with op a little. General opening principles can carry you pretty high, but that’s the exception. I know some 800s who have a repertoire while when I was 800 uscf I didn’t even know what the four knights was called (I just called it “the opening”). I broke 1000 by improving calculation, yes, but when I studied openings I was able to improve quickly as well.
Looks like the confusion (or disagreement) is about words and phrases only. You need to know where to put your pieces in the opening. Most people call it opening theory. You seem to call it ideas instead of theory, or something like that. I'm not talking about knowing exactly each and every half move, but to know how to organize your own pieces. They have their known places, like bishop on g2.
I have to disagree with op a little. General opening principles can carry you pretty high, but that’s the exception. I know some 800s who have a repertoire while when I was 800 uscf I didn’t even know what the four knights was called (I just called it “the opening”). I broke 1000 by improving calculation, yes, but when I studied openings I was able to improve quickly as well.
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This is interesting. For my part whatever level you are at say below over the board ELO 2400, I would say tactical training is vital. To me it's the basic language of chess. Along with tactical training that I would say focusing on technical and then complex endgames is the best way to learn chess. Once you have done that middle games can be better understood - to be fair most people will need guidance from a coach to make real progress at that point.
Openings for 1000 to 1800 are simply not that important. What counts is knowing the defenses to tricks and gambits so you don't get blown off the board, and learning a number of model games for each opening that you play that teach the most common plans that arise. Lajos Portisch once wrote the goal of the opening is to reach a playable middle-game. I'll support that. I think a lot of the comments are centered around the idea that studying openings for the bulk of your training time is misguided - I agree. I also have an opinion on what it means to study chess openings - but I'm not going into that here. I will say you will need a good, well rehearsed opening repertoire when you start pushing for titles, but not before.
In summary as Capablanca pointed out long ago - learn chess backwards. Endgame - Middlegame - Openings. If you really want to improves, then tactics and endgames (technical then complex) will lay the foundation for 'getting good'. I should note that I didn't do that and it cost me 30 years! I wish I had realize all that when I was 12 ..... Oh well.

You can get to the master level without studying openings really at all. As long as you understand basic opening principles. Develop efficiently, control the center, knights before bishops, castle, connect the rooks, pawn storm if opposite sides castled, thats pretty much all you need to know. Tactics are what win or lose games, not which opening you picked. Also it is much easier to learn an opening when you are 1500+ level as opposed to 1000 level. The stronger you get tactically, the more patterns you have solidified and the easier it is to learn openings, because you will actually UNDERSTAND the moves and why they work, and you will be learning the openings instead of memorizing them. Any 1000 level player devoted to studying openings is wasting their time. Again what is the point of getting a perfect opening on move 10 you are +.3!! but then you suck at tactics so you blunder two pawns by move 14 and you are in a lost position.
And I got from 700 to 1300 in 6 months, without doing all your stuff

My tactics (now called puzzle rating) is 2249, but I have no chance against people rated 1500 in the opening. This is my last game:
Any advice on how to study/improve openings? I can't find any of the advices in this thread helpful. The game is lost after move number 6.

Something funny just happened. I played another game, this time against a player rated 1471, and the opening was almost the same. This time I managed the first 6 moves because I remembered what happened in the previous game. But of course, the game was lost after move number 7.

You should probably learn theory/strategical ideas/ ideas in a particular openings, plans, etc.. I recommend you choose an opening that fits your style and secure a response to all sane moves from opponent, you don't have to lock yourself in a room and study lines and lines of chess if you don' enjoy it. I also recommend to choose an opening that fits your style, since your style is probably tactical since you have 2000+ tactics, I recommend you not play the Qgd, because when you play it you wanna get a firm position, I recommend the KID, and 1.e4, and then against 1.e4 you can choose one because I love the french defense but not sure if it is good for you

Quote: "secure a response to all sane moves from opponent"
I thought this thread was all about not doing that. Have I misunderstood something?
I know this is an old post and probably weeded out already. But if it's any consolation I am over 2000 USCF and no real opening theory till after I hit that 2000 benchmark. I know a few masters that play by feeling and never opened an opening book in their lives. I also know some of those masters never studied a tactic puzzle either. I am not saying any one person is right or wrong in this. What I am saying is that when it comes down to it, I agree that you don't need opening theory from ECO to learn basic chess. I also agree that tactics are in the top 3 things you should focus on. Where I separate is that I don't believe tactics puzzles are always necessary. And I don't think all players should always avoid some opening theory.
For example: Tactically you should probably understand that tactics are not different than chess strategy. So saying, "I won a game without tactics just planning" is just simply a misnomer. For one thing checkmate is a tactic. Tactics are just plans. The difference between tactical planning and strategic planning is you know the outcome of a tactical plan most of the time, and you may not know the outcome of a strategic plan. Tactics tend to be more straight forward and concrete. I spend most of my tactical studies looking at games and categorizing the tactics found in them. I themed them most of the time. There is always more than one way to skin a tactic.
Opening theory: I once trained someone from 900-1800 in less than a year before he went to college for med school. He spent most of his childhood and around 2-3 years of his adulthood fumbling around with the 900 rating. When I met him he was 22. I met with him one on one and not once did I show him an opening. I told him, "play 1. e4 and use what I tell you and it will improve your play." And he did. I also told him that he can mimic some of the other club members and the info I told him would pretty much guide him through most openings. I went over the elements of chess, Some basic strategic principles, and we spend a lot of time talking about tactics in games and endgame ideas. We went to tournaments together and compared games and results. The only thing I was a little jealous of was right before he left he played in a local tournament with me that was one of our first CCA tournaments, and he obtained his first USCF CM norm before I got my first. I kind of made a friendly bet with him that he couldn't do it and he did. Most people don't need real opening theory at all. Some people need framework. For example: A player they like they can "copy" moves as long as they put some kind of logical thought to why the moves were played. Or they can study a system opening like the london, or a small opening book you can print onto 3-4 sheets. I have a book right now that I created in lichess. Has basic Ruy Lopez theory and some basic replies for 1. e4. I can literally print that right now and it would't take more than a few pages for all the replies. You can learn it in less than 2 hours if you want to take it seriously, and 30-40 min if you want to just look at it for ideas. This file satisfies the people that need a framework similar to the London or other systems like that. But I guarantee you don't "NEED" to study openings all that much or at all at least from 0-2000.
And since it was brought up prior, I am not stating this as someone who can't reach the level I am claiming. I claimed at least up to my level and I did give mention that yes, I know some masters who have similar training. If you want a follow up to the agree idea? I once spoke with GM Jesse Kraai after asking the question in chesslecture.com about how I should approach learning my openings and even requested a video on the openings I was interested in. His reply was quick and straight forward. "I will analyse one of your games for free and make a video of it if you promise me you will forget openings and study real chess." The video is still in chesslecture.com by the way. At the time I believe I was about 1700 and I was considering serious opening study but couldn't figure out how to study them properly, so I asked the question to chesslecture.com support and they forwarded my email to Jesse. I am going to say, that in combination with that comment, a comment NM Brian Wall said, and the video. It changed my whole outlook on chess study. Not everyone is the same.. So saying one way suits all is just bad education.