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
Despite the ugliness of his decline, Bobby Fischer deserves to be remembered for the great things he did for chess and for his immortal games.
Garry Kasparov 2004
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
There is no room for gallantry in chess.
Irving Chernev
In order to become a grandmaster class player whose understanding of chess is superior to the thousands of ordinary players, you have to develop within yourself a large number of qualities, the qualities of an artistic creator, a calculating practitioner, a cold calm competitor.
Alexander Kotov
I give 98 percent of my mental energy to Chess. Others give only 2 percent!
Robert Fischer