CSS (Computer-Schach und Spiele) on the Playchess server run by the German company ChessBase. Cash prizes were awarded (totaling 132,000 euros between 2005 and 2008) for the top finishers. Thus the famous freestyle chess tournaments were born with the participation not only of the great GMs but also of any other player who wanted to register for the tournament. To the surprise of many who were certain that the GMs would prove superior, it was an amateur player – expert in the use of chess software – who won the challenge. Advanced chess then evolved into freestyle chess with rules very different from those of León, and a new category of chess players was created: the "freestyle chess player", called the centaur (a mythological term chosen to imply joint work by human and computer). In this new type of chess, the integration between man and machine has become fundamental and constant. The true strength of the centaur lies precisely in knowing how to combine the strategic capacity, which belongs to the human mind, with the analytical supremacy of the computer. And when the combination reaches the right balance and a profound synergy is created between the human and the electronic component, the centaur becomes an unsurpassed player, stronger than the strongest chess players in the world, and manages to produce games that are close to perfection. Precisely for this reason the freestyle chess sets for centaurs have recently been defined as the "Formula 1" of chess. Some rules of the game have since changed. Advanced freestyle chess meetings no longer take place in dedicated rooms, but rather at home, live in front of an internet-connected computer via a web server like Playchess or Infinity Chess, and chess players at every level and from all over the world can participate. Meetings usually begin with the elimination stages, with couplings according to the Swiss system, and the top finishers access the next and final stages. The centaur finalists, who generally use a pseudonym (nickname) usually challenge each other in a round-robin tournament for the title. Online tournaments There were, therefore, a number of advanced chess tournaments online, called centaur freestyle chess tournaments. The most important were the aforementioned PAL/CSS Freestyle Tournament, which had a very high level of play and the winners, in chronological order, were: Zacks (Steven Cramton and Stephen Zackery, USA), Zorchamp (Hydra, UAE), Rajlich (Vasik Rajlich, Hungary), Xakru (Jiri