Hello all,
Are the leagues the only tournament scheduled for 2015 so far? If that's the case, I don't think they are sufficient, because of all the objections made in this thread.
Some comments from my memory about the leagues from way-back-when:
1) They were always plagued with high dropout rates, because you do play a lot. If you don't, people leave between seasons even more. A partial solution was to allow people to skip a season, and re-enter without starting at the bottom again (e.g. placing them as though they had played and lost all their games)
2) The promotion/relegation dynamic becomes a bit silly in the lower leagues. When we had 10-12 leagues, it was usually the case that almost everyone in the bottom level got promoted, due to dropouts. The top two leagues in the pyramid were the only levels with many relegations, the B-level (3rd tier) would typically get 1 or 2 at most.
3) It took too long to get from the bottom to the top of the pyramid. We had Premier, A, B, C and D tiers. Since we normally took about 7 months per season (including the offseason), that means it would take 3 years to win the tournament from your first season. (the dropout replacement mechanism of picking a leader in the lower league means you could do slightly better in practice)
4) It is the absolute hardest tournament to run. Partly due to its size, but also the fact that the games were started in quick succession means that you need to be really on the ball to keep it moving. Automation of game starts would help a lot in this, if someone codes that, but you still need to hunt for replacements fast to stop delays, because you can't start the new season until the old one is finished, and people have had the rest period (which is essential, for sure). I also found that the metagame aspect made it impossible to play and direct simultaneously- my season in the Premier league was not without controversy, and one player left as a result of this.
This meant that a new player entering at D-level would normally play an irrelevant season, and would take many seasons to reach the top. If I were to redesign the tournament, I would strongly consider making it have only 3 tiers, and having the bottom tier have larger leagues, e.g.
Premier League: 7 players, 4 relegations
A1-2: 7 players, 2 promotions, 3 relegations each
B1-3: 14 players, 2 promotions each.
This has the capacity for up to 63 players, and means that the pyramid isn't too deep, and there are only the top 21 above the bottom league, so hopefully the promotion-by-dropout dynamic can be reduced.
For 77 players (close to the maximum we achieved of 84 players), you can add an extra B league, and promote the 4 winners plus 2 highest scoring second placers. In light of how hard the tournament is to run, though, I would cap it at 63 players, and turn people away/wait list them. (e.g. based on time spent playing/ some other heuristic for commitment). Maintaining an active wait list is one way of keeping the tournament running easier, btw.
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Other tournaments:
I think the reason the leagues were so successful when they were running was because they were part of a programme of tournaments that ran throughout the year. People were used to tournament play, and the leagues could be the bread-and-butter games. I don't think they suit as the "premier event", but when they are the only tournament, people play one-off games as the bread-and-butter, and the leagues are the important games.
You can see the tournaments that were ran simultaneous to the leagues on tournaments.webdiplomacy.net
I will summarise my thoughts on those I know about, because they seem to be a distant memory
1. GFDT: I really liked this tournament (thewonderllama's creation), because anyone could participate, the format made a lot of sense, and it wasn't too much of a game burden, so people could play their best (in the league that's not so possible because there are too many games). The 2 rounds + final format takes about 10 months, so you should be able to run it annually. Not too hard to run, either.
2. The Masters: The idea behind the tournament was to be a strict no-metagame tournament, designed to make meta-gaming almost impossible. As such it was kind of an antidote to the league. You have 49 players, and play each player exactly once across 8 games. It is anonymous players (or at least, was when the feature was added), and you can only get points by winning a game, so there were no alliances to the end of the game. It was quite long, but if you keep to schedule, lasts about a year. Can be quite hard to run, but again, if it were possible for the TD to set games up directly, rather than getting players to set them up, it would be much easier to run. Personally I didn't enjoy it, but that's biased by the fact that I am much better at drawing than at winning, only played 2 games in it, and was very, very tired at the time.
3. Champions Trophy: The tournament winners over the last year play a showcase match (or two in event of a draw). Ended up feeling like a GR challenge game, and not so meaningful. To make it a success, you could make it anon, and then have a forum discussion thread to encourage spectators. If you don't do this, there's not really enough people involved to make it feel like a tournament. On the plus side, it's basically trivial to run.
4. World Cup: Apparently the 2012 World Cup is still running(?!). Its fun, but I don't think it is necessary to revive this in order to have a strong tournament schedule. It is apparently super hard to run!