Prize-winning pianist Jun Hwi Cho at the Phillips

When South Korean pianist Jun Hwi Cho won the New York International Piano Competition in June, it was only one in a string of competitive triumphs for the talented 18-year-old. And Cho's concert Sunday afternoon at the Phillips Collection, a nicely varied program of Beethoven, Schubert, Liszt, Messiaen and Gabriela Frank, offered further proof of his professionalism and keyboard discipline.