Mate in 2 Puzzle help!

From the given position, there is only one black move that doesn't run into mate if I see correctly. There lies the key

Yes, this mate in 2 puzzle relies solely on the concept of zugzwang, which is quite common amongst these short mates. However, there aren't too many pieces here, so the observant solver shouldn't have too much difficulty.
Here's a tougher nut to crack though - First, it is a bit longer (mate in 3). Second, there are more pieces on the board. Third, it uses a more extended zugzwang theme, but not solely - it is the incorporation of a new threat that makes it all work.
Not sure who composed this (heinzie? )

Not sure who composed this (heinzie? )
Jiri CHOCHOLOUS
Ceskoslovenski Sach T.T. 1895
4° Prix
In Breuer n° 552

If you solve it in less than an hour, you're on your way to becoming a Grandmaster! :p
http://www.chesskillertips.com/index.php?f=76
I can not seem to solve this mate in 2 puzzle. Please help. White goes first and mates in 2 moves.