Five Queens

Place five queens on a chessboard, such that every square including
those occupied by the queens is under attack.

Place five queens on a chessboard, such that every square EXCEPT
those occupied by the queens is under attack.

Find the smallest number of queens needed to attack every square on the
board in the above two conditions for square boards from 2x2 to 7x7.
Source: rec.puzzles.
Solution
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