Magnetism in Chess


I don't know how this is called. Decoy? Attraction? Hmm... but there are magnets and magnums in chess as well. Yes, actually, I think this is a fine example - of a magnet. Maybe it's a language issue, we Dutch really have a "magnet" trick up our sleeves. Maybe it's what you Americans call attraction.
When I saw the thread title I was remembered of a composition by L.I. Loshinsky which has the magnet theme. It's a cool one. #3. Easy!!