> There really isn't anything special about poker in comparison to chess
They are dramatically different. There is no hidden information in chess, there are only two players in chess, the number of moves you can make is far smaller in chess, and there is no randomness in chess. This is why you never hear about EV in chess theory, but it’s central to poker.
Hidden information doesn't make a game more complicated. Rock Paper Scissors have hidden information but it's a very simple game for example.
You can argue there is no hidden information in poker either if you think in terms of ranges. Your inputs are the public cards on the board and betting history - nothing hidden there. Your move requires a probability distribution across the whole range (all possible hands). Framed like that hidden information in poker disappears. The task is to just find the best distributions so the strategy is unexploitable - same as in chess (you need to play moves that won't lose and preferably win if the opponent makes a mistake).
More complicated? That’s ambiguous. It certainly makes it different.
If you apply probabilistic methods it doesn’t remove hidden information from the problem. These are just quite literally the techniques used to deal with hidden information.
They are dramatically different. There is no hidden information in chess, there are only two players in chess, the number of moves you can make is far smaller in chess, and there is no randomness in chess. This is why you never hear about EV in chess theory, but it’s central to poker.