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Re:Stockfish 14 by muzani on Monday July 05, 2021 @04:55AM (#27735861)
A blunder is when someone makes a wrong move then and there that costs them the game. At AI levels, there are very few, if any, blunders. I think parent commenter means a strategic mistake, where they made a mistake about 5 moves in advance.
Re:Stockfish 14 by FartyMcFarter on Monday July 05, 2021 @06:56AM (#27736560)
> A blunder is when someone makes a wrong move then and there that costs them the game.

Not quite, as that would imply that each game has at most one blunder. It's quite possible for two players to blunder back and forth multiple times.

Re:Stockfish 14 by muzani on Monday July 05, 2021 @10:25AM (#27738324)
True. The technical definition of a blunder on lichess and chess.com is that it puts you in a losing position. You can blunder further while in the losing position. And your opponent can blunder which puts them in the losing position, only to be reversed by your blunder.

A mistake is like a blunder but you're still winning, but it could be a blunder in a worse position. An inaccuracy is a bad move that doesn't cost you.

Re:Stockfish 14 by blindmute on Monday July 05, 2021 @12:17PM (#27739457)
At least on lichess, the blunder/mistake/inaccuracy distinction is based only on how much the evaluation moves. Going from +10 to +6 is still a blunder.