The wS wheel in a #3 Fleck.
Solution:
1.Bb2! (thr. 2.S~ 3.Bxg7#)
Black has eight possible moves:
1…Bb7 2.Sc6
1…Ba6 2.Sb5
1…d6 2.Se6
1…Rxh5 2.Sf5
1…h2 2.Sf3
1…Sb3 2.Sxb3
1…e2 2.Sxe2
1…Sc2 2.Sxc2
To the best of my knowledge the task had not been published with all the wS moves in a #3 Fleck (it is easily achieved in the #2 Fleck). Below you can find examples of the same task for the wR and wB and a #4 Fleck that took the author many years to compose.
