Known as the Chessboard Killer, Alexander Pichushkin set out to kill people matching all the 64 squares on his chessboard, and would cross out a square with every kill. Mostly targeting elderly people, he managed to kill about 48 to 60 people and was eventually sentenced to life imprisonment.
Anatoly Slivko made headlines when he was convicted of killing seven teenage boys in Russia. The serial killer admitted that he had killed the boys to recreate an incident where he had seen a young boy dying in a road accident and had been sexually aroused by the sight.
Darya Nikolayevna Saltykova was a noblewoman, serial killer, and sadist. She achieved notoriety for torturing and killing at least 38 female serfs. Since she was well-connected with the Russian nobility and with those in power at the royal court, Darya got away with many of her murders until she was found guilty in a trial organized by Empress Catherine II.