CREATE TABLE table_9529 ("Date" CLOB, "Tournament" CLOB, "Winning score" CLOB, "Margin of victory" CLOB, "Runner ( s ) -up" CLOB)

What tournament was on May 31, 1987?
SELECT "Tournament" FROM table_9529 WHERE "Date" = 'may 31, 1987'
SELECT "Tournament" FROM "table_9529" WHERE "Date" = 'may 31, 1987'