Assume you are in a situation that either your queen or or tower will die:
You can save your tower by using your queen to kill your oppenent's tower, but as a consequence, your queen will be eaten
or you can save your queen by moving it to a safe zone.
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For those who will say it depends:
say its a tie game with a set of a queen, a bishop, a knight, a rook, 4 pawns and ofcourse a king.
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