CREATE TABLE table_name_54 (number NUMBER, pieces VARCHAR2, name VARCHAR2)

What is the number for Chauchilla Cemetery Battle with less than 511 pieces?
SELECT AVG(number) FROM table_name_54 WHERE pieces < 511 AND name = "chauchilla cemetery battle"
SELECT AVG("number") FROM "table_name_54" WHERE "chauchilla cemetery battle" = "name" AND "pieces" < 511