When your intuition tells you that there should be a forcing combination in the position, but your concrete analysis can't make it work, try the brainstorming technique of reversing the move-order. Lev Alburt, Chess Rules Of Thumb
The creation of an operation base for the knight is one of the most important motifs in chess strategy. Luděk Pachman, Complete Chess Strategy 1: Planning The Pieces
The formation and carrying out of a plan of action is the main task in the course of the process of the chess struggle. Peter Romanovsky, Chess Middlegame Planning
To play the Slav successfully as Black demands considerable tenacity, robust defensive abilities and a healthy confidence in one's all-round skills. Graham Burgess, The Slav
In general the popularity of chess openings does, over time, bear a reasonable relationship to their objective merits. Peter Wells, Winning With The Trompowsky