The queen-and-knight combination is often referred to as the deadliest attacking force in chess. The two pieces work so well together because their differing movements complement each other perfectly. John Emms, Starting Out: The Scotch Game
In a pawn ending with pawns on both sides of the board, the most important rule is: the side which has its passed pawn further from the other pawns usually wins. Jesper Hall, Chess Training For Budding Champions
A simple test: have I files for my rooks? If I have, I am sure to have freedom for my other pieces as well. Cecil Purdy, The Search For Chess Perfection
One of my key recommendations for aspiring chessplayers is to get to know yourself really well and then build an opening repertoire and a playing style that fits you. Lars Bo Hansen, How Chess Games Are Won And Lost
The dark-square bishop is the Stonewall Dutch player's key minor piece, and White almost always benefits from exchanging it off. Steve Giddins, 50 Essential Chess Lessons