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