Question: Who won mens singles the year sveinn logi sölvason tryggvi nilsen won mens doubles and elsa nielsen won womens singles
Schema: create table table_14903999_1 (mens_singles varchar, mens_doubles varchar, womens_singles varchar, PRIMARY KEY (mens_singles))
SQL: select mens_singles from table_14903999_1 where mens_doubles = "sveinn logi sölvason tryggvi nilsen" and womens_singles = "elsa nielsen"