Nyarlathotep's Puzzle Dungeon #4

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nyarlathotep

Same rules as always:

 

1.) White must mate in 3 moves.  No exceptions.  Assume that you have 1m30s on the clock and each move takes you 30s to make (whether it actually takes you 30 seconds, 5 minutes, 10 minutes or 10 seconds, just assume it takes 30s).  If you don't mate in 3, it's game over and black wins.

 

2.) There is only one key move to obtain mate in 3.  (If you find others, please let me know Innocent )

 

3.) No first key move will result in a check, a capture, or involve the promotion of a pawn.

 

 
 

 

 You can find previous Dungeon Puzzles below:

Puzzle #1

Puzzle #2

Puzzle #3 

thinkdifferent
for some reasons I found this quite difficult.Good puzzle.
Blacklord_SI

good!

 

vinodagnihotri

One more excellent puzzle from Nyarlathotep (not easy by any means)! Pls keep them coming :-)

greersome
I'm going to have to come back to this.  Great puzzle!  Did you come up with this one yourself?!
hanngo

cool!