Is this an example of a backwards pawn? e4 e5 
d3


At this point, if d3 advances, say at 3. d4 it does not control d4, it is controlled by a sentry (an enemy pawn controlling d4) and is adjacent and behind a same colored pawn at e4. 

Is the d3 pawn backwards? I was told no, because it is supported by c2, but Wikpedia's definition of a backwards pawn doesn't care about a backward's pawn's support, only the support it has moving forward.

Thank you.
The pawn on d3 is not backwards since (as you say) it is protected by another pawn.

There must be something missing from Wikipedia's definition. Later on the article (http://en.wikipedia.org/wiki/Backward_pawn) contradicts itself.


  Also, the opponent can place a piece, usually a knight, on the hole in front of the pawn without any risk of a pawn driving it away.


In your example, if black puts a knight on d4, the pawn move c3will drive it away.