[Glossary](https://unicum.gg/glossary.md)/[Ratings](https://unicum.gg/glossary/category/ratings.md)

# Stronghold RatingSR

The Stronghold performance rating used on unicum.gg: roster strength multiplied by how far above even a clan wins, with boosted rosters discounted.

Also known as SR, skirmish rating.

[Stronghold](https://unicum.gg/glossary/stronghold.md) results are hard to compare because a [clan](https://unicum.gg/glossary/clan.md) chooses its opposition and its volume. SR answers a narrower question: how good is this roster, and does it win with it.

`SR = roster strength x (win rate / 50%)^1.5 x (1 - boost share)^1.5`

Roster strength is the median Personal Rating of the clan above 4,500. The median, not the mean: it shrugs off both the low tail of small accounts and a couple of carries.

Roster strength is measured above a competitive floor rather than from zero, so the gap between an average roster and an [elite](https://unicum.gg/glossary/elite-status.md) one is the dominant term. The win factor is neutral at 50% and super-linear, so dominating is worth more than edging it.

The last term is the anti-farming one. Strongholds, [Advances](https://unicum.gg/glossary/advances.md) especially, get played with boost accounts: small accounts with almost no [random battles](https://unicum.gg/glossary/random-battles.md) that exist only to fill a stronghold roster. That absence cannot be faked, so a roster full of them is scaled down.

Volume is not in it at all, which is what makes it a pure skill rating. A battle floor keeps a lucky handful of games off the leaderboard, and [SRB](https://unicum.gg/glossary/srb.md) is the sibling that rewards volume.

## See it on the site

[Stronghold ladder](https://unicum.gg/clans/stronghold/t10.md)

## Related terms

[Battles-based Stronghold RatingThe Stronghold Rating with battle volume rewarded rather than merely gated, so a clan that has proven itself over hundreds of battles ranks above one with the same SR over twenty.](https://unicum.gg/glossary/srb.md)[ELOThe paired rating a clan carries per Stronghold tier and on the Global Map, where each battle moves points from the loser to the winner.](https://unicum.gg/glossary/elo.md)[Personal RatingWargaming's own rating, shown in the game client and on the portal, which grows with the number of battles played as well as with performance.](https://unicum.gg/glossary/personal-rating.md)[StrongholdA clan's own base, built from buildings that produce industrial resource and unlock reserves, and the battles fought to supply it.](https://unicum.gg/glossary/stronghold.md)[AdvancesThe fifteen against fifteen Tier X Stronghold format, where clans attack each other's bases in scheduled events for a larger share of resource.](https://unicum.gg/glossary/advances.md)

[Every World of Tanks term](https://unicum.gg/glossary.md)

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