CREATE TABLE table_name_14 (date VARCHAR(255), to_par VARCHAR(255), tournament VARCHAR(255), margin_of_victory VARCHAR(255))
Which Date has a Tournament of at&t pebble beach national pro-am, and a Margin of victory of 1 stroke, and a To par of –11?
    
SQL: SELECT date FROM table_name_14 WHERE tournament = "at&t pebble beach national pro-am" AND margin_of_victory = "1 stroke" AND to_par = "–11"