Nice work and some thoughs

There is one division I would like to see. A twin melee rumble (like 5 teams of 2 bots each). Joining concepts of both melee and team/twin.

I like the idea, but I think it would be so crowded that it would pretty much reduce to melee strategy. (Having to fight off 8 other bots with 1 ally out there somewhere is not much different than fighting off 9 other bots.) Maybe 3 teams of 3? I've thought about MegaBot TwinDuel for a while...

I think megabot TwinDuel would be awesome! Although it might reduce to wavesurfing quite quickly. I'd also be interested in a TriDuel - a 3 vs 3. I think having that extra bot will completely change the dynamics compared to twinduel, and make surfing much harder.

Maybe split teamrumble into categories?

5 bots (teamrumble bots)

4 bots (DeltaSquad)

3 bots

2 bots (twin duel bots)

Teams with fewer bots can compete in categories with more bots but not the opposite.

Imagine 2 melee bots using minimum risk movement (dominant in melee), and 2 bots using provocative movement (dominant in twin duel). The 2 melee bots will be each on a different corner, but the 2 with provocative movement will be on the same corner ganking on the lonely melee bot. But at the same time, 3 bots close together become tasty targets for swarm targeting from other 3 teams.

There must be a balance between minimum risk and provocative movement, or a third undiscovered strategy. Maybe there is still room for inovation.

Sure, but that's assuming both bots on both of those teams survive to the final stages of the round, which seems unlikely. And even if both bots on one team survive that long, I think how much energy they've retained from the "pure melee" early stage of the round will be the most important factor. Maybe on a bigger field than 1000x1000, and/or with 3-4 teams instead of 5?

It assumes ganks in the middle of a battle weakens "pure melee" strategies somewhat. Although not in the same way as in twin duel.

With 3 teams, I believe "shooting the team with lowest energy" 2x1 strategy will dominate. One team is eliminated almost on luck, and the battle is decided between the remaining 2. It happens in most 3 player games.

There is a catch though, since the API doesn´t tell you which bots from the opponents belong to the same team. Which is not a problem in either meleerumble or teamrumble. But estimating it in team melee might be worth. This alone may change the game significantly... or not.

A bigger battlefield or 4 teams seems nice. I thought of 5 teams of 2 bots each to keep the 10 bots total from meleerumble/teamrumble, and 2 bots per team from twin duel. And see strategies from all 3 divisions clashing against each other.

Any of these divisions sounds pretty interesting to me. I think the main hurdle is just getting that first person to write up a 3x3 team or add TwinMelee support to one of their bots. =) Nobody wants to commit the time if nobody else is going to compete, but if someone just does it, I bet others would follow suit...

I'm kind of caught up in my Diamond refactor right now, but maybe I'll make time for something fun soon. ;) Or try running a PerceptualRumble client just for kicks.

Combat can perform okayish in almost any battle setup, having to change the packaging only. With the exception of handicapped setups like restricted codesize, PerceptualRumble or ExtendsRobot.

Hmm... all of those divisions do sound interesting to me too. Now it has me thinking about how best to adapt the LunarTwins/Polylunar strategy to a bit different formats...

Yeah, my thoughts are that something like this would be perfect for school/lab/office tournaments. Just give it a new name in the client, set up a participants list somewhere and away you go.

In the free tier I'm not really going to run out of disk space any time soon, a rumble of 300 bots comes out at around 2MB, it's the database writes which are the killer. From what I can tell, App Engine pricing starts at $2.10 a week for the minimum paying tier. That gets you quite a bit more quota than the free tier, which probably should be enough for everything, pretty much forever, without crossing that $2.10 limit. For now I'm going to see how much I can push the free tier, though.

I still have a bunch of optimisations I need to make - like not pulling all of the rumble data into memory just to serve the rankings page (it's all cached, doesn't affect my quota, just speed) - which should make it more snappy both on the main rankings pages and on the RatingDetails page the RR client queries occasionally.

A hidden feature: if you add timing=1 as an argument into your GET for any of the pages it summarises the timing breakdown for CPU usage at the bottom of the page and lets you know how many bots were pulled from cache vs. from the datastore.