|White to move and win|
I particularly liked this study because of the subtle Bishop's moves, which you will see underneath, in case you didn't solve it.
As you've already suggested, the mating threats are almost "touchable", but how exactly should we do that?!
1. Ra2+ Kb3 2. Bd1+ Kc3 [ 2...Kc4 3.Be2+ Kb3 ( 3...Kd5 4. Ra5+-; 3...Kc3 4.Rc2+ Kb3 5.Bc4+- and we brought our Bishop to cover the escaping squares:) 4.Rb2+ Ka3 5.Bd1 Qg8 to prevent mate on a2, but the position is hopeless, White has another Knight, 6.Nd4+-]
Black's last move was 2...Kc3, how should White continue?
I always love these quiet moves, such as...
3.Be2! having the same mating ideas, with Rc2, Bc4 and Ra2. Black is trying to prevent that by playing: 3...Qb7+ 4.Kc1 Qb3 amd we reach the following position:
Does it look like White has some troubles?!
5.Bc4! game over.
I've always considered studies a good working tool for improving your calculation abilities. It's even better if you manage to see all the lines without moving the pieces.
Coming back with more exercises, if you want of course:)