Which people had the best 10-year period when Capablanca had the best 15-year period?
CREATE TABLE table_21314 (
    "Position" real,
    "best year" text,
    "best 2-year period" text,
    "best 3-year period" text,
    "best 5-year period" text,
    "best 10-year period" text,
    "best 15-year period" text
)
SELECT "best 10-year period" FROM table_21314 WHERE "best 15-year period" = 'Capablanca'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Which people had the best 10-year period when Capablanca had the best 15-year period? ### Input: CREATE TABLE table_21314 (
    "Position" real,
    "best year" text,
    "best 2-year period" text,
    "best 3-year period" text,
    "best 5-year period" text,
    "best 10-year period" text,
    "best 15-year period" text
) ### Response: SELECT "best 10-year period" FROM table_21314 WHERE "best 15-year period" = 'Capablanca'