What is a blunder in chess? (opens in new tab)

What is a blunder in chess? The tension between the qualitative and quantitative answers to this question is at the heart of different approaches towards chess, and more broadly, how quantitative metrics may lack context, but qualitative metrics lack precision. Qualitative answer There are many qualitative answers to this question, especially when comparing “blunders” and “mistakes”: “a move that negatively affects their position in a significant way” ~ chess.com “severely worsens the player’...