Advanced positions are the positions that programs offer without you having to enroll in the program's categorical internship year. In other words, you are trying to match for a program's PGY-2, 3, & 4 years only. A categorical position is a spot that includes the PGY-1 year in the package. Many programs offer both types of spots. However, most offer the majority of their anesthesiology spots in the categorical division. Limiting yourself to Washington State and Arizona puts you at a severe disadvantage unless you are a highly, highly competitive candidate. Those programs may have a total of hypothetically 50 positions among all of the programs combined, but only 10 may be "advanced" spots so you are reducing your chances of matching by 80%. These are just hypothetical numbers, but you will be at a pretty severe disadvantage applying only for advanced positions and only in two states. Again, this is assuming that you are not a superstar candidate with great letters of rec.