Ten years ago, when Uruguayan pianist Raquel Boldorini appeared in a recital at the Organization of American States, she tantalized her audience with a performance that hinted at artistic depth but offered, in its stead, sumptuous colors and impressive technique. Yesterday at the Phillips Collection she played the kind of program that gave her a chance to fulfil those promises she had dangled so enticingly. It was worth the wait.

Her reading of the Mozart F-major Sonata, K. 332, emphasized its Italianiate lyricism and Mozart's operatic inclinations. There was a suppleness to the phrasing that mirrored the rhythms of the Italian language and a sonorous warmth that reflected its generally sunny nature.

She reserved her heavy artillery for the Chopin B-minor Sonata, a piece that needs every bit of concentration and artistic imagination a performer can muster. It was a marvelous account, full of romantic self-revelation and emotional energy, but carried out with both balance and control.

Her readings of the three pieces from Debussy's "Images" have gained in spontaneity since she played them at the OAS, and de Falla's "Fantasia Betica," still a virtuoso showpiece, seemed to be less frantic.

The program will be broadcast over WETA-FM on Feb. 22.