Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_64211 ( "Position" real, "Gymnast" text, "Floor" text, "Pommel Horse" text, "Rings" text, "Vault" text, "Parallel Bars" text, "Horizontal Bar" text, "Total" real )

### Question ###
What is the horizontal bar score with a pommel horse of n/a, and the position is less than 27, and the parallel bars score is 15.800?

### Accurate SQL ###

SELECT "Horizontal Bar" FROM table_64211 WHERE "Pommel Horse" = 'n/a' AND "Position" < '27' AND "Parallel Bars" = '15.800'