[sanderjd]

This is a nitpick but maybe a slightly interesting one: in theory it's true that chess is not a "game" in this sense, but in practice it is not true. The "imperfect information" is all the paths that exist past the horizon of computation. When playing another human, that horizon is not very far away at all, so there is plenty of uncertainty. And it is absolutely possible to bluff to take advantage of a less well informed opponent, for instance by playing a move that may be less optimal, but is more likely to provoke a response that you know is bad but your opponent does not. At the very highest level this is less and less possible, and it does devolve into more of a computational exercise than a game, but I would argue that the same tactical constriction as skill improves exists in poker as well.

[aqme28]

Was going to say this.

You wouldn't see so many scholar's mate games if this was the case.