"We shall begin with the center, which we propose to treat in the first place with the less experienced player in mind." - Nimzo
Because Nimzo wants to include in his audience those less experienced, he then gives a number of rules-of-thumb(ROT) that he knows have many exceptions.
Let's call the "less experienced" players; "beginners". They may have years of experience playing chess, but not in the theories of chess. Beginners may also be novices with little to no playing experience. We just assume they know the rules of chess.
Hence, as examples of the ROT, Nimzo says
"No, let each officer make one move only, and ... dig himself in." and
"Hence, as Lasker truly observers: in the opening one or two Pawn moves, not more." and
"By development is to be understood the strategic advance of the troops to the frontier line."
I look at that last as a ROT and definition combined; and not a really good definition of development. But how can one define development quickly to a beginner? A better attempt is given here:
https://en.wikibooks.org/wiki/Chess_Strategy/Development and that is a paragraph.
And like every ROT, there are exceptions; many exceptions. For example, there are openings where a Bishop does not move at all and yet it is playing an important role in the position. Another exception to this ROT is the Ruy Lopez: Exchange Variation, where White moves his Bishop twice.
So he has to explain why a pawnless advance would not work - via a variation.
He has to explain why White can break the ROT in the Scandinavian Defense and play 2.exd5 even though White will also play 3.d4 and hence have made 3 pawn moves.
He gives several other opening variations that break the ROT, and he explains this by saying that gaining tempi results in the ideal of being ahead in development.
And if you have "embarrassed" yourself, by inferior moves, you can sometimes "liquidate" (aka exchange pieces), to disembarrassed yourself. :-)
The section 6 on maintenance and surrender of the center is the beginning of Nimzo's attack, and axe to grind, against the Classical School, especially Tarrasch, and their dogmatism regarding how one should fight for the center.
Diagram 10 is an example of Nimzo's attitude. He titles the diagram with "White has freedom, Black has pressure". Tarrasch would say White is better because of that freedom. Nimzo would disagree that White is better, though he says "The restraining process is not easy, ...".
Nimzo is trying to make a science of chess. One of his key ideas for that is the concepts of restraint and blockade can be applied throughout a chess game. Hence, he wants to apply those ideas to the fight in the center.
The pawn hunting section is interesting. I agree with Nimzo's idea there. However, how is a beginner to know if taking a center pawn can be done "without too great danger"? In my beginner course I have an example of Black taking the White e-pawn in a Ruy Lopez where it might be difficult for a beginner to know there was danger. See:
https://lichess.org/study/17K9yQRL/UebZQRdB#8
I'm not saying that the ROT are "bad". They are useful to a novice who wants to start playing chess immediately on learning the rules of chess. IMHO it should be emphasized to novices that there are many exceptions to these ROT.
In my tabia I talk about whether the ideas from the Schools of Chess should be taught to beginners and intermediate players at all. See
https://lichess.org/forum/team-jomegas-tabia/the-schools-of-chess?page=2#11
I have found that such players games are full of egregious tactical blunders and the root causes are
a) not having internalized piece movement/capture,
b) poor visualization,
c) the inability to create and maintain the attack/defense (A/D) network, and
d) a non disciplined move selection method.
Also playing too fast!
Nimzo is not going to address any of that, of course, because he is writing what he considers a scientific explanation of best chess play in theory.
"We shall begin with the center, which we propose to treat in the first place with the less experienced player in mind." - Nimzo
Because Nimzo wants to include in his audience those less experienced, he then gives a number of rules-of-thumb(ROT) that he knows have many exceptions.
Let's call the "less experienced" players; "beginners". They may have years of experience playing chess, but not in the theories of chess. Beginners may also be novices with little to no playing experience. We just assume they know the rules of chess.
Hence, as examples of the ROT, Nimzo says
"No, let each officer make one move only, and ... dig himself in." and
"Hence, as Lasker truly observers: in the opening one or two Pawn moves, not more." and
"By development is to be understood the strategic advance of the troops to the frontier line."
I look at that last as a ROT and definition combined; and not a really good definition of development. But how can one define development quickly to a beginner? A better attempt is given here:
https://en.wikibooks.org/wiki/Chess_Strategy/Development and that is a paragraph.
And like every ROT, there are exceptions; many exceptions. For example, there are openings where a Bishop does not move at all and yet it is playing an important role in the position. Another exception to this ROT is the Ruy Lopez: Exchange Variation, where White moves his Bishop twice.
So he has to explain why a pawnless advance would not work - via a variation.
He has to explain why White can break the ROT in the Scandinavian Defense and play 2.exd5 even though White will also play 3.d4 and hence have made 3 pawn moves.
He gives several other opening variations that break the ROT, and he explains this by saying that gaining tempi results in the ideal of being ahead in development.
And if you have "embarrassed" yourself, by inferior moves, you can sometimes "liquidate" (aka exchange pieces), to disembarrassed yourself. :-)
The section 6 on maintenance and surrender of the center is the beginning of Nimzo's attack, and axe to grind, against the Classical School, especially Tarrasch, and their dogmatism regarding how one should fight for the center.
Diagram 10 is an example of Nimzo's attitude. He titles the diagram with "White has freedom, Black has pressure". Tarrasch would say White is better because of that freedom. Nimzo would disagree that White is better, though he says "The restraining process is not easy, ...".
Nimzo is trying to make a science of chess. One of his key ideas for that is the concepts of restraint and blockade can be applied throughout a chess game. Hence, he wants to apply those ideas to the fight in the center.
The pawn hunting section is interesting. I agree with Nimzo's idea there. However, how is a beginner to know if taking a center pawn can be done "without too great danger"? In my beginner course I have an example of Black taking the White e-pawn in a Ruy Lopez where it might be difficult for a beginner to know there was danger. See:
https://lichess.org/study/17K9yQRL/UebZQRdB#8
I'm not saying that the ROT are "bad". They are useful to a novice who wants to start playing chess immediately on learning the rules of chess. IMHO it should be emphasized to novices that there are many exceptions to these ROT.
In my tabia I talk about whether the ideas from the Schools of Chess should be taught to beginners and intermediate players at all. See
https://lichess.org/forum/team-jomegas-tabia/the-schools-of-chess?page=2#11
I have found that such players games are full of egregious tactical blunders and the root causes are
a) not having internalized piece movement/capture,
b) poor visualization,
c) the inability to create and maintain the attack/defense (A/D) network, and
d) a non disciplined move selection method.
Also playing too fast!
Nimzo is not going to address any of that, of course, because he is writing what he considers a scientific explanation of best chess play in theory.