Alexander Pichushkin (The Chessboard Killer)
There are 64 squares on a chessboard. This is the exact number the Chessboard Killer was trying to accomplish by murdering people. According to reports, he has killed 49 people, short of his target. The way he has killed them is definitely vomit-inducing. He started by targeting homeless men and lured them into his house using vodka. Once they are drunk, he repeatedly hammers them in the head and once the skull was broken, he inserted the vodka bottle in it.