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Why is 6th move considered as a blunder

@MagnusCarlsen910 said in #1:
> f3 one

Stockfish dislikes f3 because
...it misses the chance of Nd5, getting active play with the knight eyeing c7 to take away Black's castle rights
...takes away the natural development square of your king's knight
@MagnusCarlsen910 said in #1:
>
>f3 one

Nd5 gains a tempo, forcing the queen to retreat, and gaining a lead in development with the right moves. If the queen captures your bishop, you have Nc7+, winning the queen on the next move. f3 cuts of the diagonal, but makes it more difficult to develop the knight on g1 to a good square, while Nf3 would also cut off the diagonal while controlling more center squares and opening an opportunity to castle. The king will also now be more open if you castle kingside.
The alt line mentioned is an attack and every attack is mandatory to promulgate is the premise, in chess an attack missed should be an L at the end of a game logically played.
What is your goal in the opening? With opening i mean the first, say 12 moves or so.
1.- Fight for the center.
2.- Open lines to develop minor pieces.
3.- Develop minor pieces to their optimal squares.
4.- Secure the king.
5.- Put pressure on the opponent.

That is your goal for the next 12 moves. While it is almost impossible to fulfill all of those requisites in one single move, you make moves that get you closer to your goal. They should at the very least, contribute to advance your goal in at least 1 of those 5 departments. If they contribute in more than 1 way, better.

So what did f3 contributed to?
Does it fight for the center? No
Does it open lines to develop minor pieces? No, in fact, it closed a line for the queen.
Are you developing a minor piece on its optimal square? No, it was a pawn move, which actually bloqued the natural square of the knight.
Does it secure the king? No, in fact, it puts the king in danger, as the diagonal is now open, you may have trouble castling.
Does it put pressure on the opponent? No, it made your development subpar for the lack of better squares for your minor pieces, most likely the opponent will pressure you instead because you basically gave him a tempo or 2 with a worthless move.

So, not only f3 does NOT make you closer to your 12 move plan, it actually hurts in more than 1 way.

Had you play other move, say d3, d4, nf3, b3, even Ne2, either move is better than f3.
d3. Open lines for bishop/
d4. Opens lines for bishop AND fights for the center.
Nf3. Develops a minor piece.
b3. Opens lines for the bishop which will help fight the center.
Ne2. Develops a minor piece, blocks the queen, but prepares d4, which will open lines and helps you fight the center.

But its not necessarily that you cant play f3. sometimes you do have to play it despite the cons. However, when you have to play it is because there was a concrete reason for it, IE you were forced and it was the best answer.

In this case, you werent forced and obviously, it wasnt an answer to anything. In fact, more of a question. Why?

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