CREATE TABLE table_12186309_1 (womens_singles VARCHAR, mens_doubles VARCHAR)

What was the women's singles were men's doubles were steen fladberg jens peter nierhoff?
SELECT womens_singles FROM table_12186309_1 WHERE mens_doubles = "Steen Fladberg Jens Peter Nierhoff"
SELECT "womens_singles" FROM "table_12186309_1" WHERE "Steen Fladberg Jens Peter Nierhoff" = "mens_doubles"