A good rule of thumb is that you want to preserve your other rook when you lose or sacrifice the exchange because otherwise you can't compete adequately on files and ranks. Andrew Soltis, The Art Of Defence In Chess
The main factor governing the success of an attack on the enemy king is whether you can bring more attacking pieces to bear on his king position than he can muster for the defence. John Nunn, Secrets Of Practical Chess
Go through Reuben Fine's Ideas Behind The Chess Openings. It has everything. It's one of the best books, and it will definitely help you get stronger. Bobby Fischer, quoted in How To Get Better At Chess
The initiative is dangerous, both objectively and subjectively. A computer doesn't mind whether you are threatening it or not. It has nerves of steel and takes a strictly objective view of everything, Humans are different. Valeri Beim, How To Play Dynamic Chess
The result of most queen-and-pawn endings hinges largely on whether or not the side with the advantage can get his king safe. Nigel Davies, The Chess Player's Battle Manual
My research confirms Capablanca's claim that the bishop is a bit better than the knight when fighting against a rook, or (in the endgame) against multiple pawns. Larry Kaufman, Chess Life magazine
In general, the player with the isolated pawn will station rooks on the files immediately adjacent to the pawn. Then minor pieces can be stationed on the squares diagonally in front of the pawn. Eric Schiller, Strategy For Advanced Players
Many readers will find that they need to rethink much of their basic attitude to the game. One example of this would be the tremendous emphasis which is placed on the dynamic use of the pieces, if necessary at the expense of the pawn-structure, or even of material. Peter Griffiths, Secrets Of Grandmaster Play
Nimzowitsch argued that the base was the proper target in a (pawn) chain. But a player can attack the base and front of a chain simultaneously. Andrew Soltis, Pawn Structure Chess
The most important positional elements, apart from material balance, are strong and weak points, open lines, the centre and spatial advantage, and harmonious piece-placing. Alexander Kotov, Train Like A Grandmaster
It is more difficult for Black to realise equality in the Queen's Gambit than in most other openings. Max Euwe & Walter Meiden, The Road To Chess Mastery
Every move has pros and cons, and is in accordance with some general principles, but flouts others. How then do you decide which move to play? The answer is that you usually have to analyse. John Nunn, Grandmaster Chess Move By Move
Because in the course of normal opening play White will have achieved some central superiority, Black needs to generate at least a modicum of counterplay in the centre. Edmar Mednis, Practical Middlegame Tips
One good way to defend difficult positions is to ask yourself what you would hate to see if you were in his shoes. Jeremy Silman, How To Reassess Your Chess
If in the endgame a file is in your permanent possession, do not worry about an eventual breakthrough point - this will come of itself, almost without any assistance on your part. Aron Nimzowitsch, My System
A loose piece, ie a piece which is not protected by another piece, is often the object of a combination based on a double-attack - a move which simultaneously attacks the loose piece and some other piece. Max Euwe & Walter Meiden, Chess Master v Chess Amateur
When you hold a better position, you must attack in order to convert your advantages into a full point. Igor Khmelnitsky, Chess Exam And Training Guide
Avoid wasting time when playing the opening. Aim for the following guideline: five moves in five minutes; 10 moves in 10 minutes. Edmar Mednis, How To Be A Complete Tournament Player
It is impossible to play chess even passably well unless you see all captures and checks at your own and your opponent's disposal. Cecil Purdy, The Search For Chess Perfection