CREATE TABLE table_203_473 (id DECIMAL, "no." DECIMAL, "date" TEXT, "tournament" TEXT, "winning score" TEXT, "margin\ of victory" TEXT, "runner ( s ) -up" TEXT)

what was the best winning score ?
SELECT "winning score" FROM table_203_473 ORDER BY "winning score" LIMIT 1
SELECT "winning score" FROM "table_203_473" ORDER BY "winning score" NULLS FIRST LIMIT 1