Here is an idea I had for a gunboat tournament. Rules are as followed:

We start with a map that can accommodate the number of players we get (highest being the 19 Haven). Three games of that map, gunboat, WTA, anon, with a 2 point bet will be created. The victory conditions will be half of the supply centers + 1 for all maps.

All three games will run at the same time, and when a game is over each player will be given points with the following system (the LOWER POINTS you get the better, like golf)

Win: 0
Draw: number of people in the draw
Defeat: Total number of players in the maps
Survive: Total number of players minus the number of defeated players.

When all three games are finished, scores are compared, and people are dropped depending on their score. People are dropped until we reach the number for the next map (for example, if we start with a Haven map, and Known World is next, we drop 4 people.) The lowest scores get removed first. In the case of a tie, supply centers are compared to determine who is dropped. If the supply centers are equal, a neutral judge will randomly decide who is dropped.

For Pauses/Extends, each person gets a total of an 8 day pause, requested on this thread. If it is less than four days, he uses an extend. If it is higher, we pause. An extend automatically uses up four of the right days.

Readying is highly encouraged, but not required.

Here is a proposed list of maps:

The winner is whoever has the most points total in the last game. If it is a tie, Supply Center count, higher one wins. If that is even, there will be another match after that, with all the players who made it to the next math. This keeps happening until someone has the most points.
Haven: 19
World Diplomacy IX: 17
Known World: 15
Fantasy World: 12
Modern Diplomacy II: 10
Indians of the Great Lakes: 9
Colonial Diplomacy: 7
American Conflict: 6
FINAL ROUND: Ancient Mediterranean: 5

Please let me know if you object to a variant being on that list, or if you want to add one.