CREATE TABLE table_12275654_1 (year VARCHAR(255), mens_singles VARCHAR(255), womens_singles VARCHAR(255))
How many times did Niels Christian Kaldau win the men's single and Pi Hongyan win the women's single in the same year?
    
SQL: SELECT COUNT(year) FROM table_12275654_1 WHERE mens_singles = "Niels Christian Kaldau" AND womens_singles = "Pi Hongyan"