I remember a University colleague cheating with an assignment in AI - he had to build an alpha-beta pruning based opponent in connect4. He lingered until the very end, and then resorted to the Internet (and 10 years ago I don't remember Google :). He later commented: "0 in AI... but 10 in websurfing!".
It's interesting that you cite the chess game. There are a lot of books on chess, and many openings have been studied and are learnt by a lot of people. What would you think about someone reviewing his chess book while doing an online (e.g. play-by-mail) match? I'm not sure I'd reduce it all to "take it only from your memory", even if I've to admit that I don't really know where to draw the line.
Flavio
perl -ple'$_=reverse' <<<ti.xittelop@oivalf
Don't fool yourself.