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.
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Quotes of the Day
Vasiukov hadn’t won a single game against me for 59 years and then suddenly won. I can’t call it shame. Shame or no shame, it’s a pity that he won…
Viktor Korchnoi 2012
If the 12th game (from the match Carlsen-Karjakin)… were a restaurant dish, I would send it back to the chef.
Nigel Short 2016
Looks like I’m going to raise the average age of the field and lower the average rating!
Garry Kasparov 2017
Tal develops all his pieces in the centre and then sacrifices them somewhere.
David Bronstein
If the FIDe elections were not decided by the votes of the delegates but by the world’s chess society as a whole, there would not even be a competition.
Anatoly Karpov NIC 2010