How to get the Killer king achievement!
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To get Killer King's achievement, you only need to deliver a discovered checkmate by moving the king. giving a checkmate by casting would also work.
Castle Victory and Killer King achievement can be obtained at the same time?
Here is is Chess Achievements for ParisSpider https://www.chess.com/awards/ParisSpider/achievement/fun_killer_king
You have to earn a two rooks vs. single king, or two queens vs. single king, or one rook and one queen vs. single queen. (And luck, because you can deliver this checkmate only if your opponent don't resign). For example: