Editing Advanced chess (section)

==On the Internet==
In the wake of León, the ubiquity of the [[Internet]] and a high number of commercial and free [[Internet chess server]]s has made it possible for anyone to play advanced chess over the Internet.

The first was CCO ([[Computer Chess Organization]]), which organized advanced chess events, most of which took place on [[Free Internet Chess Server]] (FICS) or on the correspondence website. It was not necessary to be a member of the CCO to participate in its tournaments, although the organization pointed out that membership was highly desirable. Internet chess events usually used unrated games, but CCO did propose the introduction of chess on the Internet of a third category of players: the "advanced-chess player", called (C), with a special advanced-chess [[Elo rating system|rating]] category, since most chess servers on the Internet already had suitable mechanisms.

At the same time that CCO ended (2005), the PAL/CSS Freestyle Tournament was born, sponsored by the PAL Group on [[Abu Dhabi]] and implemented by 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.<ref>[https://en.chessbase.com/post/dark-horse-zacks-wins-freestyle-che-tournament Chessbase: Dark horse ZackS wins Freestyle Chess Tournament]</ref>

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 freestyle chess sets for centaurs have recently{{When|date=January 2024}} been defined as the "Formula 1" of chess.<ref>[http://computerschach.de/Files/2008/Freestyle%20%E2%80%93%20the%20Formula%201%20in%20Chess.pdf Freestyle – the Formula 1 in Chess]</ref>

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.{{Citation needed|date=January 2024}} 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.{{When|date=January 2024}}<ref>[https://en.chessbase.com/post/eleven-qualify-for-main-freestyle-tournament PAL/CSS Freestyle Tournament]</ref>{{Failed verification|date=January 2024}}