Aagaard stresses that before you calculate, you must list (typically 2-4). A mistake many amateurs make is falling in love with the first move they see. The universal technique is to force yourself to ask: "What else?" This includes checks, captures, threats, and quiet positional moves.
: Identifying all logical moves before starting to calculate deeply to avoid missing hidden resources. Combinational Vision (Visión Combinatoria) tecnicas universales de calculo jacob aagaard pdf
Anticipating your opponent's threats and ideas as a central part of your own calculation. Aagaard stresses that before you calculate, you must