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10

Its evaluation drops form +2.3 to +0.0, so it considers it a blunder. Of course this does not match what a human understands as "blunder", but computers are incapable of identifying that. Your move is a perfectly reasonable one and if that's the biggest type of "blunder" you make in your games, you're on your way to a Grandmaster title.


4

Obviously 4.Nf3 is far from being a blunder, maybe the best move according to stockfish. You are missing ablsoutely nothing here. Generally these "annotations" should not be taken very seriously, helpful only for absolute starters. I personally dislike them strongly, there are just adding noise to valuable engine output. Curiously in the early days ...


6

Since I could not find any complete explanation, I followed the eternal advice "Use the source, Luke". The Stockfish authors did a great job because their code is easily followable and commented. Relevant parts from search.cpp: // If skill level is enabled, swap best PV line with the sub-optimal one if (skill.enabled()) std::swap(...


6

Other answers have made many good points. But the main reason g3 is a bad move can be reduced to a very simple explanation: The knight on h5 is a very bad piece, it has almost no squares to go to and can easily be threatened to be trapped. The best move in the position is 1.Bd2, this is because compared to other squares for the bishop to move to, it blocks ...


18

Pawn structure. Allowing the exchange ...Nxf4 gxf4 simply weakens your structure considerably. The pawns on f2, f4 and h2 are disjointed and cannot protect each other anymore. Black can immediately start attacking f4 with a following ...Bh6, for example, and your only way to defend that pawn is by moving your queen into a pin. Due to the tactical danger ...


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