CREATE TABLE table_203_663 (id DECIMAL, "country" TEXT, "zone" TEXT, "national federation" TEXT, "#gm" DECIMAL, "#fide" DECIMAL, "national championship" TEXT)

which country has the most #gm ?
SELECT "country" FROM table_203_663 ORDER BY "#gm" DESC LIMIT 1
SELECT "country" FROM "table_203_663" ORDER BY "#gm" DESC NULLS LAST LIMIT 1