It's OK to pick solid proven openings and you should and be familiar with their move orders AND WHY plus the strategies behind their approach.
BUT below 1200 even 1600 your opponents will stray off "theory" early and often and maybe you see they didn't play Bc4 or d4 or Nc3 or push d5 but being inexperienced you may struggle to know how to adjust your play.
THE best thing to constantly practice your 1st year is understanding positioning, PAWN STRUCTURE, and how the pieces work together and outposts and how to use bishops, knights, and rooks and keep your queen on a short leash.
Plus calculation training is a lifelong process. It's what truly separates players beyond memorizing sidelines (which yes eventually becomes very useful once opponents actually play those sidelines 20 + moves) and you will start to see sidelines more often at 1600 then I'm assuming after 2000 even moreso but by then they are clever enough to learn more unique sidelines.
1.Put half your time into calculation checklist and scanning patterns and tactics training. PUZZLES
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Put another 25% into endgame training though you might only get legit equal endgames 10% under 1200 bc somebody gets mated or resigns bc of blunders. But strong endgame skills gives you the confidence in crappy positions to trade off to endgame and win there. OR you will be more terrified of position if endgame skills suck. Choose wisely.
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Last 25% familiarize yourself with move order and ideas of an extremely limited number of openings you can use.
First year maybe play London with white and Caro Kann and Slav with black. Have something for London. Usually d5,Nf6,c5 are a good start. If you play the London you will better understand how to play against it.
After a year start another white opening (1 not 3) like English or learn Queen's gambit and Indian game lines.
BUT d4/c4 lines there are a ton of responses to learn how to play against. It will be a long process or play English and need less prep.
Also maybe after first 12 to 16months learn another defense one either French for e4 or Petrov or learn Semi Slav extending from your Slav experience. Then after another 6 to 8 months learn a 2nd for the one you didn't do.
So if you went Semi-Slav then go Petrov or French.
A lot of people recommend playing e4 with white for newer players but then you have to learn to stop 10 gambits and 8 defenses which you can limit some.. like playing Scotch or Vienna.
I don't recommend trying to play against:: Lopez responses, plus Italian, plus Petrov, plus 10 Sicilians, then French, Caro Kann, and potentially Alekhine, Nimzowitsch, Pirc/Modern, Philidor, Scandy and aforementioned 2000 gambits in e4.
So in conclusion:: learn London with white, Caro Kann, Slav, and anti London with black, OH and anti English (reverse Closed Sicilian), occasional Nimzo-Larsen and Grob crap. 80% will play e4, Nf3, Bc4 against you bc it's all they know.
BUT put alot of time in understanding positions and using pieces effectively, and developing quicker precise calculation skills is a long process so don't neglect and understand even after 3 years your calculation skills will need improved. It's the biggest Game changer.
AND learn to be great at endgames your first year. Understand tempo and not wasting moves.
It's OK to pick solid proven openings and you should and be familiar with their move orders AND WHY plus the strategies behind their approach.
BUT below 1200 even 1600 your opponents will stray off "theory" early and often and maybe you see they didn't play Bc4 or d4 or Nc3 or push d5 but being inexperienced you may struggle to know how to adjust your play.
THE best thing to constantly practice your 1st year is understanding positioning, PAWN STRUCTURE, and how the pieces work together and outposts and how to use bishops, knights, and rooks and keep your queen on a short leash.
Plus calculation training is a lifelong process. It's what truly separates players beyond memorizing sidelines (which yes eventually becomes very useful once opponents actually play those sidelines 20 + moves) and you will start to see sidelines more often at 1600 then I'm assuming after 2000 even moreso but by then they are clever enough to learn more unique sidelines.
1.Put half your time into calculation checklist and scanning patterns and tactics training. PUZZLES
2. Put another 25% into endgame training though you might only get legit equal endgames 10% under 1200 bc somebody gets mated or resigns bc of blunders. But strong endgame skills gives you the confidence in crappy positions to trade off to endgame and win there. OR you will be more terrified of position if endgame skills suck. Choose wisely.
3. Last 25% familiarize yourself with move order and ideas of an extremely limited number of openings you can use.
First year maybe play London with white and Caro Kann and Slav with black. Have something for London. Usually d5,Nf6,c5 are a good start. If you play the London you will better understand how to play against it.
After a year start another white opening (1 not 3) like English or learn Queen's gambit and Indian game lines.
BUT d4/c4 lines there are a ton of responses to learn how to play against. It will be a long process or play English and need less prep.
Also maybe after first 12 to 16months learn another defense one either French for e4 or Petrov or learn Semi Slav extending from your Slav experience. Then after another 6 to 8 months learn a 2nd for the one you didn't do.
So if you went Semi-Slav then go Petrov or French.
A lot of people recommend playing e4 with white for newer players but then you have to learn to stop 10 gambits and 8 defenses which you can limit some.. like playing Scotch or Vienna.
I don't recommend trying to play against:: Lopez responses, plus Italian, plus Petrov, plus 10 Sicilians, then French, Caro Kann, and potentially Alekhine, Nimzowitsch, Pirc/Modern, Philidor, Scandy and aforementioned 2000 gambits in e4.
So in conclusion:: learn London with white, Caro Kann, Slav, and anti London with black, OH and anti English (reverse Closed Sicilian), occasional Nimzo-Larsen and Grob crap. 80% will play e4, Nf3, Bc4 against you bc it's all they know.
BUT put alot of time in understanding positions and using pieces effectively, and developing quicker precise calculation skills is a long process so don't neglect and understand even after 3 years your calculation skills will need improved. It's the biggest Game changer.
AND learn to be great at endgames your first year. Understand tempo and not wasting moves.