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
Every chessmaster was once a beginner.
Irving Chernev
I think I would beat Tal pretty easily. Fischer would be more difficult, but I think I could beat him too.
Magnus Carlsen
Tal develops all his pieces in the centre and then sacrifices them somewhere.
David Bronstein
Carlsen: “I ran out of steam towards the end but fortunately I played better than he did”
Magnus Carlsen 2017
Chess is beautiful enough to waste your life for.
Hans Ree