Promotion
These puzzles are decided by a pawn promotion, or by the threat of one. Promoting with check is the usual way to do it safely.
A pawn on the seventh rank is a queen that has not moved yet. See what happens if you promote with check, and what the opponent must give up to stop it.
Source database: 148,209 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.