The scheme of a game is played on positional lines; the decision of it, as a rule, is effected by combinations.
Richard RetiA knowledge of tactics is the foundation of positional play. This is a rule which has stood its test in chess history and one which we cannot impress forcibly enough upon the young chess player. A beginner should avoid Queen's Gambit and French Defence and play open games instead! While he may not win as many games at first, he will in the long run be amply compensated by acquiring a thorough knowledge of the game
Richard RetiThe essential disadvantage of the isolated pawn ... lies not in the pawn itself, but in the square in front of the pawn.
Richard Reti