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
Usually the side with the two minor pieces would like to avoid exchanging other pieces, whereas the side with the rook should seek exchanges. Esben Lund, Rook vs Two Minor Pieces
A desire to create complications at an early stage in the game sometimes urges a player into unwarranted experiments. Alexey Sokolsky, The Modern Openings In Theory And Practice