Stokel-Walker, ChrisThe bitter rivalry behind the world's smallest chess program(англ.). The Kernel. The Daily Dot (20 сентября 2015). — «In mid-1982, a small quarter-page advert appeared in a computer hobbyist magazine. For just £5 (about US$26.50 today), the ad’s pixelated block text promised a computer chess program with “absolutely flicker-free display” and an opponent who would make its move on average just six seconds after yours. “Sensational 1K ZX 81 Chess,” claimed the copy, and ignoring that today-inexplicable numerical assemblage, the important points are “sensational” and “chess.”». Дата обращения: 7 марта 2021. Архивировано из оригинала 23 сентября 2015 года.
Stokel-Walker, ChrisThe bitter rivalry behind the world's smallest chess program(англ.). The Kernel. The Daily Dot (20 сентября 2015). — «In mid-1982, a small quarter-page advert appeared in a computer hobbyist magazine. For just £5 (about US$26.50 today), the ad’s pixelated block text promised a computer chess program with “absolutely flicker-free display” and an opponent who would make its move on average just six seconds after yours. “Sensational 1K ZX 81 Chess,” claimed the copy, and ignoring that today-inexplicable numerical assemblage, the important points are “sensational” and “chess.”». Дата обращения: 7 марта 2021. Архивировано из оригинала 23 сентября 2015 года.
