CREATE TABLE table_10751 ("Entrant" TEXT, "Constructor" TEXT, "Chassis" TEXT, "Engine" TEXT, "Tyres" TEXT, "Driver" TEXT, "Rounds" TEXT)

How many rounds have a chassis of thl2?
SELECT "Rounds" FROM table_10751 WHERE "Chassis" = 'thl2'
SELECT "Rounds" FROM "table_10751" WHERE "Chassis" = 'thl2'