CREATE TABLE table_55270 ("Round" CLOB, "Date" CLOB, "Matches" FLOAT, "Clubs" CLOB, "New entries this round" CLOB, "Prize money" CLOB)

What was the date for a round that only had 1 match?
SELECT "Date" FROM table_55270 WHERE "Matches" = '1'
SELECT "Date" FROM "table_55270" WHERE "Matches" = '1'