Coincidentally enough, a shot I'd taken of a Grouper at a cleaning station placed in two contest. Same exact shot. My only defense is, both contests had deadlines fairly close together and although I like to think all my shots are winners, there's no guarantee. So I entered the photo in both comps.
As far as I know, there's no problem with that. You just have to make sure your entry for one contest is postmarked before the results are announced for the previous. BTW, I'm no expert of course; I've just examined the rules from a number of contests, and sometimes sent questions to the organizers.
To further the dilemma, I've got several different, what I'd call quite different compostions from tht one session. You can see another one of them in the Wetpixle bi-monthly that's in judging. Wonder if this meets Linda's definition of a different compositon? I've entered yet another version in BTS.
I would think that different compositions in different frames from the same session would be fine, by my interpretation. But perhaps not from the same shot/frame. I think what they are trying to prevent is someone taking one shot, and cropping it different ways (e.g. vertically and horizontally) or doing things like flipping it to get a different composition. Usually it's stated something like "derivations from the same photo" in previous winners are prohibited.
But not all contests state this. The rules are certainly not all the same for all contests. For example, LAUPS does state that dodging and burning (as Todd mentioned) are acceptable, but NCUPS does not. While I know how to dodge and burn with prints, I'm not even sure how I would do that with slide film, unless I did it digitally and then output to film. Certainly my lab doesn't support this in making slide dupes. So, I personally have decided I won't worry about what details are kosher for various contests; I just send my unmanipulated stuff in and hope that the playing field is somewhat level. Otherwise, it'd be too nightmarish for me to keep track of which versions had which things done to them.. On the other hand, maybe if I did, I'd place better than runner-up sometime! :? Nah, it's less work to just keep striving to take better photos... :wink: