Question: Which people had the best 10-year period when Capablanca had the best 15-year period?
Schema: create table table_1710426_2 (best_10_year_period varchar, best_15_year_period varchar, PRIMARY KEY (best_10_year_period))
SQL: select best_10_year_period from table_1710426_2 where best_15_year_period = "capablanca"