Fabel

An old traditional puzzle created by Karl Fabel.  White to play and NOT mate in one move
 

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

  1. Rc6+  Rxh7

All other legal first moves bring mate in one.