I won a game by getting lots of points doing it ;) but was contested and I could see their point.
Here are two examples:
PLACES
OTHER
or
BRILLIANT
SCORE
I can see from the official rules something similar is allowed:
PASTE
BIT
The difference here is that BIT, PI and AT are created. So there is more than one parallel word created.
But are the examples I give only one parallel word is created, is this ok?
The play you describe is both legal and generally easier to do than the multi-cross play you cite as a rules example.
The general rules relevant here are that, first, all the letters for a single play must be in a single line, either vertical or horizontal, and second, that all tiles adjacent to another tile (vertically or horizontally) must be part of a permissible words in each direction of adjacency. Finally, at least one tile of any new play must be adjacent to a tile already played (except the first play of a new game, for which one tile must be on the pink star center square).
