Are the 15 Team Races in Blood Bowl balanced ?
Not perfectly balanced. However, I'm in the opinion that it's reasonably close.
Something you need to consider though... Is it really necessary to keep it perfectly balanced or are there other ways to get around this problem? I really don't see how you can make teams perfectly balanced. And even if you did, you'd get into trouble when someone rolls that +ST on a player...
However, in tournament play, the game is broken if TR 150 "Stone Elf"

> TR 150 "Night Elf"
Well. This is a tricky subject. Is it the rosters that are not balanced or is it the TR system that is broken?
In my opinion, TR isn't even close to being a fair indication of how strong a team is. In an environment where teams will be uneven (ie, a TR 200 team can play against a TR 100 team) you need to handle it in a slightly different way.
Assuming people play competetively and are ranked in some way, you should reward a win against a stronger team more than a win against a weaker team. NAF uses an ELO based ranking system which FUMBBL has adopted which will do this which does this.
In short, what you do is that you calculate a theoretical win probability and use that as a guide for how much to increase or decrease a player's ranking depending on the outcome of the game.
FUMBBL recently switched over to use a custom strength value for ranking purposes instead of TR. So far, it's turned out really well:
FUMBBL Strength vs TR in rankings
This chart shows the expected win probability from the ranking formula (p) using either TR or our strength value compared to the actual results.
Now, the algorithm used to calculate the strength value is nothing I would ever attempt by hand due to the complexity of it. It's also not publically available anywhere at this point but it's based on JJs original player cost system.
The system doesn't care if you're a dwarf or a wardancer and only looks at the stats and skills of the player. This means that the system will be able to cope with teams that are not balanced.
I truly think this is the way to go if GW/Fanatic decides to make an online version of the game.
-- Christer