BTW David Ahl has placed all of his work, including this book, into the public domain https://blog.adafruit.com/2022/06/16/david-ahl-places-all-hi... and so we can link to the Hexapawn page in the original book https://dn790005.ca.archive.org/0/items/Basic_Computer_Games...

Unfortunately I do not know of an online source for the Korean edition that so inspired the original poster.