The N-Queens problem is the problem of placing N chess queens on an N×N chessboard so that no two queens threaten each other; thus, a solution requires that no two queens share the same row, column, or diagonal.

The eight queens puzzle is the problem of placing eight chess queens on an 8×8 chessboard so that no two queens threaten each other; thus, a solution requires that no two queens share the same row, column, or diagonal.

The N-Queens problem is a generalization of the eight queens puzzle.