CRO stends for Croatia and 7+7+7 are winning cards.
CHESS AS A COMPLEX DYNAMIC SYSTEM
Chess has all the qualities of a complex system:
1) the abundance of elements,
3) there is a so-called "chaos zone" where it is impossible, in principle, to predict the direction that the system would develop in certain positions. (These are positions in which human intuition is the best recipe).
MODERN OPENING STRUCTURES ARE FIRMLY LINKED TO A MIDDLEGAME PLAN OF ACTION AND SOMETIMES YOU EVEN HAVE TO TAKE THE EVENTUAL ENDGAME STRUCTURE INTO ACCOUNT! (Arthur Yusupov)
ĄAs a rule, typical middlegame positions are closely associated with a specific opening variation, so that to study them is to study the opening at the same time.
The best method of studying typical middlegame positions is to select appropriate games and analyse the plans (the tactical and strategic precepts and ideas) employed in them.ď (Mark Dvoretsky)