Neruda's father opposed his son's interest in writing and literature, but he received encouragement from others, including the future Nobel Prize winner Gabriela Mistral, who headed the local school. On 18 July 1917, at the age of thirteen, he published his first work, an essay titled "Entusiasmo y perseverancia" ("Enthusiasm and Perseverance") in the local daily newspaper "La Mañana", and signed it Neftalí Reyes. From 1918 to mid-1920, he published numerous poems, such as "Mis ojos" ("My eyes"), and essays in local magazines as Neftalí Reyes. In 1919, he participated in the literary contest Juegos Florales del Maule and won third place for his poem "Comunión ideal" or "Nocturno ideal". By mid-1920, when he adopted the pseudonym Pablo Neruda, he was a published author of poems, prose, and journalism. He is thought to have derived his pen name from the Czech poet Jan Neruda, though other sources say the true inspiration was Moravian violinist Wilma Neruda, which name appears in Arthur Conan Doyle's novel "A Study in Scarlet". The young poet's intention in publishing under a pseudonym was to avoid his father's disapproval of his poems.