Solution: 1. Kb2! [threats 2. Bc3#]
1... Bd4+ 2. Bxd4
2... Rc5 3. Bxc5#
2... Rxd4 3. Rxd4#
1... Re5 2. Bxe5
2... Bd4+ 3. Rxd4#
1... Re5 2. Rc3
2... Bd4, Rxe4 3. Sd3#
2... Bxf2, Rd5 3. Rc4#
1... Rd4 2. Bxd4
2... Bxd4+ 3. Rxd4#
2... Bb6/a7/d6/e7/f8 3. Bc3#
