Alexander Yuryevich Pichushkin (Алекса́ндр Ю́рьевич Пичу́шкин, born 9 April 1974), also known as the Chessboard Killer (Убийца с шахматной доской) and the Bitsa Park Maniac (Битцевский маньяк), is a Russian serial killer who is believed to have killed at least forty-nine people, and possibly as many as sixty, between 1992 and 2006.