The "Killer King" is a secret, rare achievement on Chess.com awarded for delivering checkmate via a discovered check caused by moving your king. It is not a direct mate by the king, but rather moving the king to reveal a checkmate from a rook, bishop, or queen.
The "Killer King" is a secret, rare achievement on Chess.com awarded for delivering checkmate via a discovered check caused by moving your king. It is not a direct mate by the king, but rather moving the king to reveal a checkmate from a rook, bishop, or queen.