For the rest of you, here are the diagrams provided as 'typical responses' to the chess position memory test from players of varying standards. The squares highlighted in green show where errors were made - either by forgetting a piece, including the wrong piece or adding in a piece where there shouldn't have been one at all.
(yes I know there's something wrong with the pawn on f3. Bug in my graphics programme that I don't seem to be able to fix. Looks weird doesn't it?)