CREATE TABLE table_name_51 (tyre VARCHAR2, chassis VARCHAR2, rounds VARCHAR2, engine VARCHAR2)

When the engine Ford Cosworth DFV 3.0 v8 has a chassis of m23 and in rounds 14-15, what is its Tyre?
SELECT tyre FROM table_name_51 WHERE rounds = "14-15" AND engine = "ford cosworth dfv 3.0 v8" AND chassis = "m23"
SELECT "tyre" FROM "table_name_51" WHERE "14-15" = "rounds" AND "chassis" = "m23" AND "engine" = "ford cosworth dfv 3.0 v8"