In 1912, Leonardo Torres Quevedo built El Ajedrecista (the chess player), one of the first autonomous machines capable of playing chess. As opposed to the human-operated The Turk and Ajeeb, El Ajedrecista was a true automaton built to play chess without human guidance. It played an endgame with three chess pieces, automatically moving a white king and a rook to checkmate the black king moved by a human opponent. In his work Essays on Automatics, published in 1914, Torres Quevedo formulates what will be a new branch of engineering: automation and designed an electromechanical version of Babbage’s Analytical machine which included floating-point arithmetic.