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
My relation with Korchnoi depends on whether he has slept well. If he had bad dreams, he speaks a lot of rubbish.
Anatoly Karpov 2005
Tal develops all his pieces in the centre and then sacrifices them somewhere.
David Bronstein
FIDE is now a political organization. And being a political organization, it, of course, means that people in FIDE have some other interests – that is, to sit in their positions for the next hundred years.
Silvio Danailov 2016
I think that the World Champion should try to defend the quality of play more than anyone else!
Boris Spassky