The Colle-Zukertort explained.

[0] (don’t skip this part. It is important) I answer why the Colle-Zukertort system is my favorite d4 opening and a d4 opening recommended by me:

This opening is my favorite d4 opening for a reason. It is a system opening which means that the move order is flexible, and it combines the attack, part of the pawn structure, and the simplicity of the London system(but it is not so simple that it will be hated by chess players), the solidity and part of the pawn structure of the stonewall, but it is not so simple that it will be hated by chess players. Chessbrah has a speedrun on this opening so check it.

[1] The theory: Colle-Zukertort:
This system follows: d4, Nc3, e3, Bd3, b3, Bb2, Nd2, and short castle, and it is usually in flexible move orders. If Black fianchettoes kingside, play Be2 instead of Bd3 and c4, Nc3 and the fianchettoed bishop on b2. if Black plays Bf5 or Bg4 you should play c4 then Qb3 to put pressure on the b3-g8 diagonal and attack the b7 pawn. You can also play h3 against Bg4 as a side line. If Black plays Nc6 or creates a bishop and queen battery on the e7-a3 diagonal respond with a3 to keep your d3 bishop safe. If they play c5, play b3 to prevent c4.
The system leads to either an aggressive middlegame, which is sharp and a tiny bit risky, or a positional c4 plan, which is simpler and solid. Most of the time at high level, your opponent will gain a lot of queenside space, so if you choose the attacking route, move quickly or else that amount of the loss of space will be the result of your downfall.

[2] Aggressive Style: Colle-Zukertort:

After development, play Ne5 to open your queen’s path supported by the d4 pawn and b2 bishop and play f4 after to ready a rook lift and I will leave you here because the position get too complicated to explain. I will explain this part. If Black plays Nxe5, recapture with either pawn to remove the f6 knight, making way for Qh5. If they ever move the f6 knight that’s your clue to attack (if you're ready with the pieces). One way is to open the long diagonal for the b2 bishop by trading your e4 pawn and e5 knight to activate the b2 bishop and another way is to do it is to do a rook lift or to bring the queen out. If Ne5 isn't safe, you can either rely on the c4/positional plan or even sacrifice the pawn(I will leave you alone for this line)for activity.

[3] Positional Style: Colle-Zukertort:
Now let’s shift to the positional style by focusing on pawn structure instead of pieces. After development and the c4 Nf3 Bb2 and Be2 line, after c4 make sure to remember Rc1 to take control of the c file. If your opponent trades the c and d pawns, you’ll likely end up with c4 and d4 pawns, which can become passed pawns with either d5 or c5 which is a strong endgame asset. Even early in the game, the endgame matters. You can also play a4, a5 to try to trade off the isolated pawn and the c pawn is now passed. If your opponent doesn’t trade on the sauares c4–b5, you can slowly shift into an aggressive setup. But if they do trade, you can simplify and aim for a favorable endgame with passed pawns on the b and c files. make sure you understand the plans before playing the opening. If you want to play a more flexible line then play c3 to defend the d4 pawn then decide if you want to play e4 or c4 and remember to put rooks on the file you will open. If you go for e4 be careful of your d4 pawn getting loose, so I don’t recommend e4 immediately before c3. Once again please ask any questions if you have and check the speedrun of chessbrah about this opening.

I made it split so that it would not get too long for the application. I am sorry if this looks like chatgpt like because I wanted to shorten it so I told chatgpt to do it, but then someone said that they didn’t like the chatgpt like stuff, so please tell me how to change it from chatgptlike, to human text.

And also I want to know if you can make a blog in chess.com app. Have fun with the opening.

And please ask any questions you have about the opening

thanks

can you show a game with this

so we can understand it better

I am on app so I can’t do it, but it would be appreciated if someone would do that and no need to annotate I already got it here.

That's easy. Don't use ChatGPT.

I already did it, I regretted it, then I want to change it back.

I wouldn't recommend it, although it has been in my repertoire for quite some time with success. However, I made a video on it, and many seem to find it very instructive:

I saw that vid.

My experience tells me that the critical line is this:

1. d4 Nf6 2. Nf3 e6 3. e3 c5 4. Bd3 Be7 5. O-O d5 6. b3 O-O 7. Bb2 Nc6 8. Nbd2 b6 9. a3 Bb7 10. Qe2 Rc8 11. Ne5 Nxe5 12. dxe5 Ne4! - after which I couldn't find any advantage for White. You can check with the engine, it can't see White being ahead. And it is quite easy for Black to get there, playing only the most logical moves.

Great and interesting comment. After this or a similar move order and the annoying Ne4

I regularly struggle with a useful follow -up.

If black goes for the Kingside fianchetto they will have a strong pawn on g6 which blocks our bishop so(I will say the moves that are different than when they play anything that is not the kingside fianchetto) Be2, c4, Nf3, Rc1 and we go with the positional plan. I thought you read my stuff to know this I mentioned what I said here in the text above.

There is a c3 line for players who want flexibilty in positional style/3