What is the ACTUAL definition of blunder??

I believe a blunder is just one of the worst moves in the position. That might mean a blunder does not have to be a bad move. Who agrees wih me?

No matter how many blundering moves are in a position or how easy it is to spot a blunder, objectively a blunder is a very bad move.  A blunder immediately results in one of the following:

• A winning position transforms into an equal or losing position.
• An equal position transforms into a losing position.

Then why did one of my friends play a move that was a blunder that turned out to not be a bad move in any way?

lol

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The worst move in the position is Be4+ but it's not a blunder because it doesn't change the evaluation.

A player can make a blunder with their opponent being unable to capitalize on it.  However, it was still a blunder.

The strength of a move (and for that matter the truth of a proposition) is not determined by the outcome.

Blunders can win a game, but not against a good opponent.

Engines at low depth can incorrectly class good moves as blunders.

not gonna lie, thats because his opponent was too bad to capitalize or did not see something.

:pensive:

Excuse me, it said it was a blunder because there were a bunch of good moves, and he didnt play one of them but the move was still a good one.

an his opponent was 1500

objectively, 1500s arent that good, plus time control.

and i see what u mean now.