We Will Rock You

White to play and mate in four moves
 

a

b

c

d

e

f

g

h

  

8

 8

7

 7

6

 6

5

 5

4

 4

3

 3

2

 2

1

 1
 

a

b

c

d

e

f

g

h

  

Solution

This is a puzzle in the puzzle league.  Its solution will be provided later.

Puzzle League