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).
Applying analytical methods for complex systems, as with any other dynamic system, chess can be analyzed using scientific methods.
Alexander Shashin: "Best Play: A New Method to Find the Strongest Move - Attack, Maneuver, Defend" (Mongoose Press, 2013)
Alexander Alexandrovich Shashin is a former theoretical nuclear physicist whose current occupation is teaching chess. His familiarity with modern scientific methods led him to some highly original ideas that were successfully tested in practical play and analysis.
Shashin's theory inspired the Vitruvius chess engine team in the construction of the Vitruvius Opening Book.