I think that for the highest achievements nowadays... need to have the stable as a rock scientific base. And also need to own modesty.
Alexander AlekhineYoung players expose themselves to grave risks when they blindly imitate the innovations of masters without themselves first checking all the details and consequences of these innovations.
Alexander AlekhineFor my victory over Capablanca I am indebted primarily to my superiority in the field of psychology. Capablanca played, relying almost exclusively on his rich intuitive talent. But for the chess struggle nowadays one needs a subtle knowledge of human nature, an understanding of the opponent's psychology.
Alexander AlekhineThe retreat of a minor piece to the back rank, where it cuts the lines of communication between the rooks, is permissable only in exceptional cases.
Alexander Alekhine