WHITE PLAY AND GIVE MATE IN 4
Artistic study composed by Oswald von Krobshofer (alias Opificius) (Münchner Nachrichten, 1904). Composition that is located between artistic studies and mate problems. It should be easy to find a way to mate in 4, but you will really see that it is not.
Topic: minor promotion.
The answer from the previous exercise was: 1. Rb7 cxd5 2. Rxd5#