Trapped piece
A trapped piece has no safe square. It is not pinned. It simply cannot move without being captured, and it cannot be defended where it stands.
Knights on the rim and bishops that have bitten on granite (a pawn chain on their color) are the usual victims. Attack the piece once and it has nowhere to go.
Source database: 67,547 puzzles with this tag. This trainer: 180.
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Find the move.
By rating band
These band pages are not indexed. They keep the same theme and fix the rating range.