These chess problems require you to understand the rules of chess. Assume White is on the bottom.
Expected difficulty Easy • Comment/E-mail if you want a solution to be published
Stipulations a) Is the position legal? b) Move pawn f7 to g7; is the position legal?
EDIT: Puzzle edited on 7 February.
I call this Chess 0. 😛
Yes, with at least one positive feedback, I’m starting to post these. I’m also a relatively newcomer to the field, so my difficulty rating will be based on my current knowledge at the time of the posts. And don’t expect a lot of stuff, since constructing these is way harder than constructing the usual deductive logic puzzle content. Expect more retro chess problems (or perhaps helpmates and similar), those that don’t require thinking like chess players.
Also, I might consider adding a new difficulty rating “Introductory”, which should be self-explanatory. (Retro 0 is Introductory.)
Chaos at the Sky 
I take it the third rook is a mistake? Ignoring that, I think I’ll like these
The third rook is intended. I originally put a queen there, which has been changed. 😉
Oh dear, it’s so obvious afterwards. You’ll have to forgive me: I don’t play chess a lot…
b) The move will definitely be illegal.
I mean it’s a different position, which is derived from that diagram only with a pawn on g7 instead of f7. It doesn’t mean a move of a pawn from f7 to g7.
Okay, this is twice it hasn’t been listed, so I’m asking straight out: are we to ASSUME that White is seated at the bottom of the board and Black at the top? I ask because I’ve seen that ambiguity used as an element in problems like this, and I’m fairly certain that in this case, that ambiguity is something you do NOT intend.
Oops. Yes, White is on the bottom. Unless otherwise specified (“orient the board!”), White is on the bottom.
At the risk of making a dumb mistake, I think that both positions are legal. Notation “b) BPf7->g7″ will avoid the confusion associated with the word move. I don’t the position would be legal with the board reversed – too many pawn captures. Thanks so much.
Yes, both positions are legal.