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Professionals may also differ in actual strength for a number of reasons, such as promotion not keeping up with actual gains in strength, or the fact that professional ranks (unlike kyu or amateur dan) may rise, but never fall (even if the player grows weaker). This has posed some problems, esp. with regards to international rank discernment. There are currently over one hundred people who have the rank of 9p (the highest professional rank), though many of them no longer play competitively.[citation needed] A further distinction is that some 9p players regularly hold titles, others won some titles, some entered the title leagues, and many 9p never had the fortune to achieve any of the above.