I love how the scene expresses Kingsley's realization that there's a chess prodigy in the house. Not through expository obligatory reaction shots. There's something interior going on. A language across a gulf is being recognized. Beauty is communicated from the rhythmic clacking of the chess pieces and the stop clock. This beauty speaks to Kingsley's character. He knows. The scene in this way is also saying that chess is art.
The way the scene was put together is understated brilliance. The whole movie is.