How to get killer king award??
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is this possible
Discovered mate with your king. If the opponent's king in the back rank, and can't get out because of a rook or a queen bring your king in the back rank in the back of the rook or the queen. Then, bring a rook to your king's back. Then, the king comes out and mate. Basically the two rook mate, only you make the mate with your king. I made it.
You can also get this achievement by castling checkmate; this counts as a king move even though the rook is the piece doing the checkmating.