4.Bd2 (in the Nimzo-Indian) has been heavily slagged off in the popular press. The criticism runs along the lines of "this move is just too passive." My opinion is that any move which serves a useful purpose (in this case unpinning) must be treated with some respect. John Emms, Easy Guide To The Nimzo-Indian
The Scotch Four Knights is an ideal choice for the improving player, whether playing White or Black. The variations are neither too complex, nor theoretical, both sides develop easily, and the open positions are ideal for honing tactical skills. John Emms, Starting Out: The Scotch Game
Exchange sacrifices on c3 to expose the opponent's king are often very strong in the Sicilian. Do though try to ensure that you have more attacking pieces ready to follow one up than there are defensive pieces of the opponent's. Richard Palliser, Starting Out: Sicilian Najdorf
The same general principles apply to openings and middlegames: the importance of the centre, rapid and efficient piece-development, king safety. Yet in the endgame these factors are only noteworthy by their absence. Edmar Mednis, From The Middlegame Into The Endgame
If you have not enough time on your clock for a full examination (of a position), pick a move that seems to improve your position irrespective of calculation, rather than a "fancy" move which may be good but which would need much calculation to prove it so. Cecil Purdy, Purdy's Fine Art Of Chess Annotation And Other Thoughts - Volume Two
If I repeat an opening variation that my opponent has lost badly against, I'll gain an immediate psychological advantage. He will have to confront not only my moves, but also his painful memories. Ján Markoš, The Secret Ingredient To Winning Chess
When you have a space advantage it is often wise to concentrate on consolidating the space gained before extending it further. Jonathan Rowson, Chess For Zebras
When checkmating with bishop and knight against a lone king, a king can be checkmated only in a corner of the bishop's colour. Jesús de la Villa, 100 Endgames You Must Know
If we are considering sacrificing a bishop in an attack on the king, we must be sure that our knight(s) can cooperate effectively with our queen. David LeMoir, Essential Chess Sacrifices
Having seized the initiative it is essential to develop it with all means at your disposal, not fearing either material or positional losses. Valeri Beim, Lessons In Chess Strategy
A good knowledge of the standard attacking and defensive ideas is required to play sharp openings successfully. James Rizzitano, Understanding Your Chess
In major-piece-endings, king safety and the initiative are the critical factors, more than material advantage. Steve Giddins, 50 Essential Chess Lessons
Always, when you write down the moves, also write your time or the time of the opponent. This will always reveal where mistakes are quite commonly placed during the course of a game. With one pupil his obvious mistakes tended to be a result of playing a move instantly, or pondering over it for 30-40 minutes without seeing anything at all. Jacob Aagaard, Excelling At Positional Chess
When material is not equal, but only slightly out of balance, positional advantages usually decide the outcome. This is most evident when a player gives up the exchange for one or two pawns. Andrew Soltis, What It Takes To Become A Chess Master
One of the great virtues of the two bishops is their ability to control the opponent's rooks, both from a defensive (control of invasion squares, effective defence of vulnerable points ...) and an attacking point of view. Lluís Comas Fabregó, True Lies In Chess
Go into an ending if the position contains factors which acquire increased significance in the endgame phase: the two bishops, the better pawn-configuration, or pawn-weaknesses in the enemy camp. Vladimir Popov, Chess Lessons
The general rule (when you have more than one passed pawn in an ending) is to push the passed pawn that is farthest away from the defender. Andrew Soltis, Turning Advantage Into Victory In Chess
In inherently superior (endgame) positions where progress is being stymied by the blockaded nature of the position, look for a pawn sacrifice or sacrifices to open things up. Edmar Mednis, Practical Endgame Tips
In your study of chess, use a tournament-size board and tournament-size chessmen as much as possible. Cecil Purdy, Road To 2000 - How To Become An Expert
The ideal division of a player's thinking time is to study general considerations when his opponent's clock is going, and to study concrete problems when his own clock is going. Alexander Kotov, Think Like A Grandmaster
Do not spend time in the opening expanding on the queenside unless you can contain your opponent's central advances. Sunil Weeramantry & Ed Eusebi, Best Lessons Of A Chess Coach
It is vastly easier to play against someone if you always know how they feel about their position. I would say that if your body language is telegraphing your state of mind, it is costing you 50 or more rating points. James Schuyler, Your Opponent Is Overrated
In the opening the pawn-majority is not felt as a major factor, but its significance grows rapidly through the middlegame, and often becomes decisive in the endgame. Dražen Marović, Dynamic Pawn Play In Chess
A lead in development is at its most useful in open positions or in situations where the active side can achieve a central breakthrough. Luděk Pachman, Complete Chess Strategy 3: Play On The Wings
If a backward pawn sits on a half-open file, it might be weak. If it isn't on a half-open file, the pawn probably won't become a significant weakness. Jeremy Silman, The Reassess Your Chess Workbook