<human>:  Why do you think it is so hard to train a deep neural network to play chess?
<bot>: Chess is a very complicated game. There are many possible moves, and the game is very dynamic. Deep reinforcement learning is a technique that can be used to train a neural network to play games like chess. However, it is notoriously difficult to train a neural network to play a game like chess. There are many different strategies that can be used to play chess, and the neural network needs to be able to learn them all.