CREATE TABLE table_45647 ("Position" FLOAT, "best year" CLOB, "best 2-year period" CLOB, "best 3-year period" CLOB, "best 5-year period" CLOB, "best 10-year period" CLOB, "best 15-year period" CLOB)

Which Position has a best 3-year period of petrosian?
SELECT MAX("Position") FROM table_45647 WHERE "best 3-year period" = 'petrosian'
SELECT MAX("Position") FROM "table_45647" WHERE "best 3-year period" = 'petrosian'