Checkmating studies which are nearly impossible to solve

Credits:
The puzzles which are compiled in this blog are taken from the British Chess Problem Society

Important Points

1. All positions are white to play.
2. There are 8 positions in total.
3. Positions 1 to 6 are checkmate in three moves.
4. Positions 7 and 8 are checkmate in four moves.
5. There are links provided separately (under each picture) - For interactive solving and the solution itself.

Good Luck!

'Three' move checkmates

Position 1 | Solution 1

Position 2 | Solution 2

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Position 3 | Solution 3

Position 4 | Solution 4

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Position 5 | Solution 5

Position 6 | Solution 6

'Four' move checkmates

Position 7 | Solution 7

Position 8 | Solution 8

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Tiny yet terrifying, Right?

On a scale of 1-100 how difficult were the above and how many you got right?