Welcome to RHL EPOCH 2.0! Counting Difficult Win Streaks since 25-08-2017 after the new Match-Making update came out.
No more jokes. Only developed clans. Only hard wars. To join this ranking a clan should have their Compound Difficulty to be at least 80. Increasignly, It means that only TH9+ war clans are allowed here. By default Difficulty is calculated only for clans, which have ever reached a Best Win Streak of 10 or which have Level Index of 110.
Clans are ranked based on Best Win Streak (BWS) but wins are counted only if the clan has a high enough difficulty when getting them and other wins are discarded. So it is called Difficult Best Win Streak (DBWS) and Difficult Win Streak (DWS) here respectively.
To find your clan here - use search to open your profile and there click on the RHL rank number to open the corresponding leaderboard page. If you don't see that number - your clan hasn't ever qualified for it yet or has no difficulty calculated. But any clan can also manually turn on difficulty calculation by pressing the record logs & difficulty button there.
Read more details here.