“She had heard of the genetic code that could shape an eye or hand from passing proteins. Deoxyribonucleic acid. It contained the entire set of instructions for constructing a respiratory system and a digestive one, as well as the grip of an infant's hand. Chess was like that. The geometry of a position could be read and reread and not exhausted of possibility. You saw deeply into the layer of it, but there was another layer beyond that, and another, and another.”