Thanks for the reply. As I am sure you have read over the past few days, please consider accelerating the release of the tie-in brawl to the new map (as with The Return to the Mines) to coincide with the release of the new map - you may be able to make a few more people 100% happy (instead of just 99.5%) :)

Should be ashamed of saying your system doesn't support something, it's 2017 you're not an indie company anymore.

If you do plan on adding weighting in the future, might I suggest you switch to some sort of bag method at the same time? The problem I have is not playing new maps or not, but playing the same maps frequently. In the long term, this averages out, of course. But on a given day it can be frustrating.

So how about this?

Given a map pool with N entries, in a game with X human players, create a draw pool of NX2 entries with X*2 entries for each map. In a standard 10 player game, there would be 20 entries for each map.

For increasing the weight of individual maps, simply increase the number of initial entries in the draw pool after this step.

Then loop over the set of X players. In the loop, look at the player's match history for the same game mode and consider the last N games. For each of those games, remove one instance of its map from the pool, if one exists.

Then randomly pick from the pool.

This has the effect of making maps you have played on recently less likely to be chosen. The effect works at the individual level and bubbles up to the match as a whole. People playing in groups would see a stronger effect than people just queuing up with randoms because they have a shared match history. People with no match history simply wouldn't have an effect on the pool.

This also has a natural effect of preferring new maps in the rotation at the beginning of a rotation change, as they won't be in the recent match history for matchmaking games.

You can tweak the *2 parameter (and correspondingly, the number of games to consider) to change strength of the effect. You can also make the effect stronger for more recent matches by removing 3 instances for the most recent map, 2 for the next, and 1 for the rest. (Just make sure the sum of whatever weights you give doesn't result in an empty pool.)

There are a ton of methods for doing this sort of thing to balance random vs. fair. Tetris alone is pretty involved.

You changed the wrong one. The first should be "it's" because you're saying "It is just a random selection." The second one should be "its own salt" because you want the possessive form.