Endgame studies are Beasts! It is totally frustrating to see those constructed positions with just a handful pawns and pieces and forsee that you will never be able to solve it and probably not able to understand most of the solution.
It was a pleasant surprise to almost solve a study that popped up during my morning Tactics Trainer drills at www.chess.com:
The problem above appears to be a study and it is both instructive and solvable. Is 2012 the Year of the Endgame?