Steinitz rated Anderssen as one of the two greatest attacking players of his time: "We all may learn from Morphy and Anderssen how to conduct a king’s-side attack, and perhaps I myself may not have learnt enough." Although Anderssen is regarded as a member of the "heroic" attacking school, he was not in favor of mindless aggression, for example he said: "Move that one of your pieces, which is in the worst plight, unless you can satisfy yourself that you can derive immediate advantage by an attack", a principle more recently labelled "Makogonov's rule". According to Fine, his approach to development was haphazard and he totally failed to understand why Morphy won.