Here's a mate in three by the 1999 FIDE "Vice Champion", Vladimir Akopian:
That was the warmup. For a real workout, try this challenging study from composing GM Gady Costeff:
The Problemist 2009
It's White to move and draw.
These studies come from recent ChessBase articles; the first one is
here and the latter
here. Please don't post the solutions in the comments - I'll do that in a few days.