Go is played on a very large board, consisting of 361 playing points. During the opening phase, there will be perhaps 50 to 100 candidates for a plausible move, and, for each of these candidates the opponent's many possible responses must also be considered as well as your responses to each of these responses, and so on. An exhaustive brute-force search for finding the best move is clearly impractical. Clearly, a go player needs some principles to guide him. After the opening phase ends, difficult decisions must still be made in the middle game - which groups should be attacked and which of your own groups need to be defended; in which direction should you attack; should you invade or simply reduce your opponent's potential territory? The expert go player definitely needs some principles to guide him in finding the best move. Even in positions where brute-force analysis is required in determining whether a group lives or dies or trying to increase your liberties in a capturing race, certain principles can provide valuable hints for finding the key moves. The purpose of this book is to bring together all the strategic and tactical