why is chess considered to be a very challenging game

Almost every chess pieces has a lot of different moves and tactic, thus making you must thinks harder before making moves. to plays chess properly you also need to know a lot of tactic and able to predict all of your opponent potential moves, which is quite a lot.

Therefore, to plays chess properly, you need a lot of things to study first. That makes playing chess very challenging, with the amount of tactics and moves it have.