oh nevermind!
went to check on a dumped BBC copy of the game (it has a fancy title screen, perhaps usborne published it as a disk at some point, or a superfan made a very fancy version?) and the behaviour i thought was a parser bug is there just as on my conversion
well, time to test play it through then :)
@mavica_again And of course, that means the beginning of the most frustrating^W rewarding phase of type-in software copying: Finding out if why it won't run is due to transcription errors or a printing error.
@arielmt because the book doesn't consider IBM PC/GW-BASIC one of the variants the game has been ported to :)
@mavica_again More type-in books needed encouragement and perseverance illustrations.
only one more page to go!