A six-mover which should prove straightforward, given the limited mating possibilities.
Realistically the b6 bishop is the only piece which can deliver a mating check, but 1.Ba5 is easily met by 1…Bd2. 1.g5 threatens 2.Bc5. After 1…Rxg5 2.Ba5 forces 2…Rg4. 3.Bc3 is premature because of 3…Bc1, so the decoy of the rook is repeated 3.f4 Rxf4. Now 4.Bc3 forces 4…Bg7 and White concludes with a Nowotny 5.d4 Rxd4 6.Bb2 or 5…Bxd4 6.Bb4.