Infinity Chess introduces a high-class league system for long games (120m/ 30s) Vote here
Re "high-class", here's an attempt at updating the "International Freestyle Top 20" from five years ago, right after the ICFB. Using that list as a foundation, I've added the provisional ratings at the bottom. After that, it gets tricky. The Centaur Grand Prix was only reported by Roland del Rio and myself. The Ultimate Challenge Tournament was an even worse case, with no official update or even a performance summary, the only report you can find about it, is the one Thomas Zipproth and I did. So with an original 2010-2014 rating list and performances from both the CWTs and the UC (how's all that for acronyms?), here's the list of centaur players:
Roland del Rio
Regarding number of games played, here's the total (unless I didn't count centaur games correctly): 66, 94, 116, 125, 47, 91, 90, 70, 68, 94 and 106 respectively.