1.Ne1 a1=Q+ and there's no knight fork cause white must deal with check to its king...

... How is the solution in the first one the best? Ne1 goes for the same fork, without losing the Bishop.

is it possible to make these puzzles interactive (ie post them like the daily puzzle)?

OMG!!! 

First: A bit easy but I didn't saw the Nd4 move.

Second: I thought something like Qxd5. I didn't see the mate Qa3#

3rd: The only that I solved.

4th: I think the most difficult

5th: My favourite.

First was easy. Second was easy once you find the idea. Third was hardish. Fourth and fifth were nice, but simple.

puzzle #2

Nice puzzles!

First puzzle:  I considered Nd4 before Bf6 with the idea of the draw position.  

2nd:  Wow I wasn't expecting that at all.  It's obvious that black threatens mate with Qa3#.  I considered Nc5 blocking the bishop's view of a3, Bxc5 Qxa5+ Kb8 c7+ Kb7 Qxc5, but couldn't see much after this point.

3rd:  For some reason I never considered that the h pawn could move 2 spaces.  I got all the way up to Bxd7 and then was lost.  Why is it that the simplest moves are often hardest to see?

4th:  Well I figured it would involve promoting the h-pawn.  I missed the better Kc4 and chose Kd5 again, and instead of Nf8 I chose Nd8 with the idea of Nf7 watching the h8 square and being able to move there if chased away by a pawn.  I couldn't think of a variation after this.

5:  Ka2 is where I went wrong :(  

The 3rd problem is what struck home the most for me.  How often do we get into these positions and not realize we have winning mate in #  positions?

Great vid, thanks for posting