If the opponent does it, it's a stupid blunder.
If I do it, it's a well-intentioned decision that turned out, in retrospect, to be unfortunate.
ah got it so me hanging my queen against someone 400 points lower than me and still winning was a calculated sacrifice that was a bit unsound. A mistake, to be sure, but not a blunder.
A mistake (?) is a move that either turns a draw into a loss, or a win back into a draw.
A blunder (??) is a move that turns a win into a loss.
A mistake in chess is a move that is not the best possible move, but it is not a serious error and does not lose material or allow the opponent to gain a decisive advantage. A blunder, on the other hand, is a very serious error that often leads to a significant loss of material or a decisive advantage for the opponent. A blunder is often the result of a lack of concentration or a failure to properly analyze the position.
I’ve noticed that sometimes I will make calculated sacrifices if I see that it puts me in a better position, the game however will count this as a blunder. I find this to be very strange because many times the very move that allows me to set up for checkmate is considered a blunder. Is it really a blunder if it wins me the game?
Maybe there is a way for the opponent to avoid checkmate and gain advantage, but your opponent didnt see it. I guess this is still a blunder.
If the opponent does it, it's a stupid blunder.
If I do it, it's a well-intentioned decision that turned out, in retrospect, to be unfortunate.