Sauerbraten was played in two different leagues/ladders/tournaments:
The oldest existing one is PSL, which was a monthly tournament. IN PSL there was a day to qualify (usually last Sunday of the month) in which everyone may participate who signed up for it previously. They provided a closed source binary to prevent cheats. Every First sunday of the month was the game of the current titleholder vs. the qualifier. Usually many people watch the games. Its was a good way to see (and learn) how the best players play.
The Premier Sauerbraten League ended 2011.
The other one is the well known ESL. They started in Spring 2009. They offer ladders mostly, but also tournaments every now and then. The stats/infos and social networking on their site is excellent. Many Sauerbrateners play it. So far they do not offer any anti-cheat binary.
other inactive sites have been:
- Super Sauer League
- Day of Sobriety
- SauerLeague – New Sauerbraten League