Final answer:
Alexander Pichushkin, a Russian serial killer, is known as the 'chessboard killer'. He aimed to commit a murder for each of the 64 squares of a chessboard and was convicted for 48 murders.
Step-by-step explanation:
The individual known as the 'chessboard killer' is Alexander Pichushkin. He was a Russian serial killer convicted for the murder of 48 people, although he claimed to have killed as many as 60 individuals. His nickname, the 'chessboard killer', derives from his goal to fill a chessboard with victims, aiming for each square on the board to represent one victim, totaling 64. Pichushkin committed his crimes in Bitsevski Park in Moscow and was apprehended in 2006, earning infamy for one of Russia's most notorious murder cases.