A move very calculated which may give up material in order to create a winning chance or a positional advantage. This action could also be used to create some psychological impact like in zeitnot with the idea to destabilise the opponent. Among sacrifices, may be mentioned the positional sacrifice, the mating sacrifice, etc.
ECHESSPEDIA
Quotes of the Day
There was a moment at the beginning when the machines were a positive, but lately we’ve being passing to the other extreme. Now it seems that a move isn’t good unless the machine says so.
Veselin Topalov 2016
The Golden Age, when machines were weak and my hair was strong!
Garry Kasparov 2017
Chess is a foolish expedient for making idle people believe they are doing something very clever, when their are only wasting their time.
Bernard Shaw
Who was the greatest chess player? If chess is an art, Alekhine. If chess is a science, Capablanca. If chess is a struggle, Lasker.
Saviely Tartakower
In the past twenty years Kramnik has played a few thousand games, and if you show me a position from one of them, in 90 percent of the time I will be able to tell you which game it is from.
Vishy Anand 2008