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Alexander Yuryevich "Sasha" Pichushkin (Russian: Алекса́ндр Ю́рьевич Пичу́шкин, born 9 April 1974 in Mytishchi, Moscow Oblast), also known as The Chessboard Killer and The Bitsa Park Maniac, is a Russian serial killer. He is believed to have killed at least 49 people, and possibly as many as 60, in southwest Moscow's Bitsa Park, where a number of the victims' bodies were found.

Pichushkin is remembered to have been an initially sociable child. However, this changed following an incident in which Pichushkin fell backwards off a swing and was then struck in the forehead as it swung back. Experts have speculated that this event may have damaged the frontal cortex of Pichushkin's brain; such damage is known to produce poor impulse regulation and a tendency towards aggression. That this event happened when Pichushkin was still a child is also significant, as a child's forehead has been proven to provide only 1/8 the protection for the brain as that of an adult. Indeed, following this accident Pichushkin frequently became hostile and impulsive, and his mother therefore decided to transfer him from a mainstream school to one for children with learning disabilities. As a result of this transfer, children from the mainstream school began to physically and verbally bully Pichushkin (at this time, a common practice in the area against those with learning disabilities), referring to him as "that retard". This abuse only served to intensify Pichushkin's rage and hostility. Upon reaching early adolescence, Pichushkin's maternal grandfather recognized that Pichushkin was highly intelligent, and felt that his innate talents were being wasted, as he wasn't involved in any activities at home, and the school he was enrolled in catered more towards overcoming disability, rather than exceptional achievement.

serial killer - Russias Worst Serial Killer Alexander Pichushkin