CREATE TABLE table_51651 ("Race" TEXT, "Circuit" TEXT, "Date" TEXT, "Pole position" TEXT, "Fastest lap" TEXT, "Winning driver" TEXT, "Constructor" TEXT, "Tyre" TEXT, "Report" TEXT)

What tyre was used in the Zandvoort circuit?
SELECT "Tyre" FROM table_51651 WHERE "Circuit" = 'zandvoort'
SELECT "Tyre" FROM "table_51651" WHERE "Circuit" = 'zandvoort'