user: Question: What is the lowest Tournaments with Highest Rank of Maegashira 13?
Columns: ['Name', 'Tournaments', 'Pro Debut', 'Top division debut', 'Highest rank']
Types: ['text', 'real', 'text', 'text', 'text']
Sample row: ['Hoshiiwato', 115.0, 'May 1970', 'July 1989', 'Maegashira 14']
SQL:

assistant: SELECT MIN("Tournaments") FROM "Table" WHERE "Highest rank" = 'Maegashira 13';