Dufek, Czechia), Flying Saucers (Dagh Nielsen, Denmark), Rajlich (Vasik Rajlich, Hungary), Ibermax (Anson Williams, England) and Ultima (Eros Riccio, Italy). Similar tournaments have been organized by FICGS, ChessBase, ICC and especially Infinity Chess. FICGS organized the Chess Freestyle Cup, which was won by Eros Riccio (1st and 3rd editions), David Evans (2nd edition) and Alvin Alcala (4th and 5th edition). ChessBase, for the 2008 Dresden Chess Olympics, organized the Computer Bild Spiele Schach Turnier, which was won by the Italian Eros Riccio. The Internet Chess Club also held their own freestyle tour dubbed as 1st Ultimate Chess Championship 2015, won by Alvin Alcala. Infinity Chess, the server directed by the CCGM Arno Nickel, has organized multiple tournaments. The most important were the following: Welcome Freestyle Tournament, Christmas Freestyle Tournament, IC Freestyle Masters, Infinity Freestyle Tournament, Infinity Chess Freestyle Battle 2014, 8-legs of Centaur Weekend Tours, IC Team Cup and Ultimate Challenge.Eros Riccio was the most successful Infinity Chess freestyle player, winning the tours up to 2012. Anson Williams led the team that won in 2014. A computer engine (Zor) ended first in the freestyle Ultimate Challenge tournament (2017), while the first centaur (Thomas A. Anderson, Germany) ranked in 3rd place. The total prize money for the 2017 tournament was $20,000. Infinity chess has developed two special Elo rankings for the centaurs. The first, based on results achieved in advanced-chess tournaments from 2005 to 2013, lists Sephiroth (Eros Riccio) in first place with 2755 points. The second, based on tournaments played from 2010 to 2014, lists Intagrand (David Evans, Anson Williams, Yingheng Chen and Nelson Hernandez) in first place with 2689 points. In future studies Centaur chess is sometimes invoked to argue that humans will continue to remain relevant as AI progresses. U.S. Deputy Defense Secretary Robert O. Work invoked in 2016 the concept of "centaur warfighting", extending the centaur concept beyond the chess world. Tyler Cowen and others assessed in 2013 that, due to chess engine advances, it was getting difficult to see any major advantage to centaurs over computers by themselves in chess, and that it seemed unlikely that centaurs would retain a significant advantage for much longer. In contrast, as recently as 2017, Kasparov has stated that, given an appropriate operator, he is confident that a centaur team could outperform the top supercomputers, while James Bridle states in 2018 that "an average player paired with an average computer