In 1892 Enriques asked Castelnuovo, who was in Rome, for advice on which direction his research should take. He took Castelnuovo 's advice and worked on algebraic surfaces, sometimes collaborating with Castelnuovo .
Sa 1892 Enriques nagtanong Castelnuovo, na sa Roma, para sa payo sa direksiyon kung saan ang kanyang mga pananaliksik ay dapat kumuha. He took Castelnuovo 's payo at nagtrabaho sa algebraic ibabaw, minsan nakikipagtulungan sa Castelnuovo.