Place two Knights, two Rooks, two Bishops and two Kings on a 4x4 chessboard, so that:
1) The Kings are not attacked at all.
2) All other pieces are attacked exactly once.
Ignore color, so every piece attacks every other piece whose square it can move to, including the Kings.
I don't know how many solutions there are, but there is at least one.
Answer
I hope I didn't make any mistakes:
Edit : Replace queens by king
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