"The most important feature of the Chess position is the activity of the pieces. This is absolutely fundamental in all phases of the game: Opening, Middlegame and especially Endgame. The primary constraint on a piece's activity is the Pawn structure"

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There is a gap between the knowledge, skills, or state of mind of the learner and what he is to learn, which it seems to me any teaching activity must seek to bridge if it is to deserve that label. Teaching activities must therefore take place at a level where the pupil can take on what it is intended he should learn.

— Paul Q. Hirst