CREATE TABLE table_51432 ("Athlete" TEXT, "Event" TEXT, "Round of 32" TEXT, "Round of 16" TEXT, "Quarterfinal" TEXT, "Semifinal" TEXT, "Final" TEXT)

For the light heavyweight 81 kg event that did not advance to semifinal, who was the athlete?
SELECT "Athlete" FROM table_51432 WHERE "Semifinal" = 'did not advance' AND "Event" = 'light heavyweight –81 kg'
SELECT "Athlete" FROM "table_51432" WHERE "Event" = 'light heavyweight –81 kg' AND "Semifinal" = 'did not advance'