Mate in 4 Puzzle

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Viznik

Can you find the mate in 4? Interesting checkmate sequence from a game I played recently 

Pawntonic

Nice checkmate

LazyDog24

What if 2.Kf8?

OrphanGenerator

After 6. Kd2 as opposed to 6. Nd8??, white's mating net is escaped.

Now for the main puzzle. All of this can be avoided with 3. a3/a4

MegaPro-123
Viznik wrote:
 

LazyDog24 wrote:

What if 2.Kf8?

Something like this 

how about just 1. f7?