what's it called when...?

this move alone makes no opening, it could also be e.g. queens gambit later or even sicilian positions after a while. but it is correct that e.g. 1.d4 Nf6 2. c4 g6 leads to Grunfeld- or Kings-Indian and 2.c4 e6 to Queens- or Nimzovich-Indian most of the time.
 
Any moves in the beginning can be called an opening by definition since you start or "open" with those moves.

If you include only those with names then 1. d4 Nf6 is an opening since it's called the Indian defence.

If you exclude a would-be opening because it can lead to another opening with a different name you would have to exclude the Ruy Lopez, for example (1. e4 e5 2. Nf3 Nc6 3. Bb5 = Ruy Lopez, 3... Nb8 4. Bf1 Nc6 5. Ng1 Nb8 6. f4 = King's gambit). Most openings can lead to another one with a different name.

I can see how you would eventually not call it an opening if the variation includes enough moves. 1. d4 Nf6 is obviously not in this category.

So, I would call it an opening.

(edit: yes, of course I meant 1. d4)
 
do you mean 1. e4 Nf6 or 1. d4 Nf6? The former is called the Aljekhin defence, in this case you are right, it seldom transforms into another opening. but d4 Nf6 isn't called anything, it is determined in the next moves what opening it is.
 
d4 nf6 isn't anything. It can transpose to too many things, queen gambit, benoni's, KID's, QID's, Nimzo Indian, even the Bogo-Indian or a million and one other things...could wind up in anything so there's no name for d4 nf6 in of itself
 
SanPellegrino said:
...d4 Nf6 isn't called anything, it is determined in the next moves what opening it is.

Soviet said:
...d4 nf6 isn't anything.

1. d4 is called the Queen's pawn opening
1. d4 Nf6 is called The Indian defence

Your definition of an opening may vary but saying that there's no name for 1. d4 Nf6 is factually wrong.
 
panzar, that's nitpicking :p. d4 queen pawn opening yeah i'll cede there, but calling nf6 an Indian right there probably isn't right- you could easily transpose to many variations of the Queen's Gambit right afterwards, the Gruenfeld isn't an Indian defense (I think?) and it starts with Nf6...

yeah your probably right but naming it off the first move doesn't seem very practical
 
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