Just for the record, the Atari 2600 also had a chess game with AI. It also had only 1024 bits of RAM, but it had access to all of it because there was no OS or underlying hardware support, like in the Speccy. So while this is definitely amazing, the 2600 version is very close in the "insanely well coded" category, especially because the 2600 had some SERIOUSLY quirky hardware to deal with. For example, on the 2600, you could only draw half the screen's background: the other side had to be a mirror image. Additionally, the columns of pixels that you drew on the screen were enumerated, to the halfway point on the screen as follows:<p>12345678,87654321,1234<p>So you were drawing forward, backward, then forward again, and that only got you half the screen!