CREATE TABLE table_37081 ("Date" CLOB, "Tournament" CLOB, "Winning score" CLOB, "Margin of victory" CLOB, "Runner ( s )  up" CLOB)

On what date was the winning score 20 (68-67-65-64=264)?
SELECT "Date" FROM table_37081 WHERE "Winning score" = '–20 (68-67-65-64=264)'
SELECT "Date" FROM "table_37081" WHERE "Winning score" = '–20 (68-67-65-64=264)'