Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Mephisto chess computer

After searching through the documentation on the product, I find that one of the four main setups for play cannot be done. The four main setups come from two states of two variables: white side can be top or bottom, white side can be computer or user. The four combinations of these are not all possible. The one that is missing is white is on bottom with white is computer. This makes it impossible to set oneself a habit of keeping white on the bottom for either computer on the bottom or user on the bottom. Keeping white on the bottom would be desireable because it makes the square addresses printed on the board, a-h and 1-8, valid. No other complaints. Good product.