A term used in chess composition or chess solving. It means that every piece must contribute towards the solution, through not necessarily in the main line.
ECHESSPEDIA
Quotes of the Day
Do you realize, Fischer almost never has any bad pieces? He exchanges them, and the bad pieces remain with his opponents.
Yury Balashov
You only task in the opening is to reach a playable middle game.
Lajos Portisch
” Chess is a sport. A violent sport.”
Marcel Duchamp
I understood that through chess I could express myself and chess became my natural language.
Boris Spassky 1995
The blunders are all there on the board, waiting to be made.
Savielly Tartakower