A situation when a piece or a pawn cannot or is forbidden to move because it could expose the king for an attack or would expose a more valuable piece behind it to capture.
In the following example Qa3 and Re7 are pinned.
ECHESSPEDIA
Quotes of the Day
Botvinnik and Tal are among the best; I also like Spassky, but I think Petrosian is better than all of them. His weakness is too many draws, even against players he could beat easily. Maybe he lacks self-confidence.
Robert Fischer 1960
I detest the endgame. A well-played game should be practically decided in the middle-game!
David Janowski
Kasparov doesn’t care about chess, but only about himself and his political goals
Kirsan Ilyumzhinov 2015
When your house is on fire, you can’t be bothered with the neighbors. Or, as we say in chess, if your King is under attack, don’t worry about losing a pawn on the queenside.
Garry Kasparov
What am I doing in this pool of piranhas?
Nigel Short 2017