[ It isn't, but Spock might be so inclined to elaborate given the general atmosphere and the current way of his company. He has no issue expounding upon a variety of subjects if the one who inquires is sincere in their interest, but most often he encounters those disinclined to ask and/or disinclined to truly learn. ]

Ah. [ It's a small sound of confirmation, but one that may tip its way over to his own focus upon that game in particular. His tone does not betray it per se, but there is something in his posture and that suggests a greater attention. It's in the lean of his shoulder. The softer, demonstrative sweep of his palm over the set. ] Chess.

[ He tips his head, just so, to the open chair across from him. ] If you are interested in learning its origins and its nature of play, I would be willing to elaborate.

[ The implication is that it's sufficiently complex, yes, but the basics are graspable. ]