yajayitva-by performing; asvamedhaih-yajna in which a horse is sacrificed; tam-him (King Yudhisthira); tribhih-three; uttama-best; kalpakaih-supplied with proper ingredients and performed by able priests; tat-that; yasah-fame; pavanam-virtuous; diksu-all directions; sata-manyoh-like the one who performed one hundred such sacrifices; iva-like; atanot-performed.