A very bad move or mistake. A typical excuse for a game one has lost is “He didn’t outplay. I simply blundered”. Such excuses are not considered good form. Mason said: the root of brilliancy is blunder.
In the following game R. Fisher played 29..Bh2??
ECHESSPEDIA
Quotes of the Day
Chess is a game by its form, an art by its content and a science by the difficulty of gaining mastery in it. Chess can convey as much happiness as a good book or work of music can. However, it is necessary to learn to play well and only afterwards will one experience real delight.
Tigran Petrosian
Petrosian-Spassky? To think I could have watched an excellent football match instead!
Mikhail Tal 1966
Chess is respected in culture and education, but our organization is far behind. FIDE must lead, not drag chess down.
Garry Kasparov 2014
I never make mistakes in chess, I only have hallucinations!
Vlastimil Hort 1987
Man has no chance to win against the modern computer. And, by and large, a confrontation between two individuals is more interesting.
Vladimir Kramnik 2015