In general, the bishop is more important (or should I say stronger) than a knight. This is because it can can cover up to a maximum of 14 squares on an open board whereas a knight can only cover 8 squares. If you want more information/tips/tricks on Chess, then you can visit http://learnplaychess.net/
Chat with our AI personalities
The piece that is better than the knight or the bishop is definitely the queen. It can move as many spaces as it wants in any direction. It is very important so you should protect it and not put it in any risky traps because there is only one of them. Inspect the board and then make a move. Chess is a very strategic game and a big part of it is to think ahead. So, only use the queen if it is safe or you have a direct route to the opponent's king! :^)