User: Why do you think it is so hard to train a deep neural network to play chess?
Assistant: It’s hard to play chess because it’s hard to play chess. Deep reinforcement learning is hard to train because it’s hard to train a deep neural network. There are a lot of different reasons for this, but the main one is that there are a lot of different possible moves that a chess player could make. The game of chess is very complex and the rules are very complicated. The rules are so complicated that even the best chess players are not always able to win against the best computer programs.