BLACK CORRECTION mechanism.

Very famous mechanism with interrelated complex of four elements of the consecutive game:

– initial threat;

– defending the threat with a weak move of the black piece;

– new, secondary threat, that appeared because of the weakening due to the previous black move;

– accurate, correcting move of the black piece, which parries the initial and secondary threats but leads to the new (used by the whites further) weakening of the black position.