**all info in this section is straight from CoC developers SuperCell.. nothing added or changed

Introducing the Friendly Challenge!

Friendly Challenges let clanmates attack one another for practice, competition, or just plain fun! Friendly Challenges are unlimited and won’t cost gold or consume Troops, Spells, Heroes or Traps. You also won’t earn resources, Trophies or other bonuses.

Issuing a Friendly Challenge:

To invite your clanmates to attack your village, look for the new "Challenge" button at the top of Clan chat. You can choose between your active layout or any other valid saved layout, including War Bases. Add some custom text (or don’t) and post the Friendly Challenge to the Clan chat. Simple!

Once posted, any member of your Clan can accept the Friendly Challenge and launch an attack against your chosen layout. Don't worry, they won't be able to steal any of your resources or Trophies. Any troops you have in your Clan Castle at the time you post will be used as defensive troops, but you won’t lose those either.

Accepting a Friendly Challenge:

When you accept a Friendly Challenge, you will attack your clanmates village using your current army. Everything you deploy will be returned to you after the battle, so don’t hold back!

The replay and results of your attack will be available in Clan chat. Of course, if your Clan can't wait that long, they can watch the attack live.

Practice, Perfect and Experiment!

Friendly Challenges will provide you with an awesome way to improve your attacking skills, perfect your defensive layouts, experiment with different troops or just have fun. Test out different army compositions, new layout ideas, or try something crazy! Clans can arrange competitions, or just have friendly back-and-forth duels.

We hope to see Friendly Challenges widely used! We see the ability to practice attacks at any time helping to motivate new attacking and defending strategies, and help Clans get even better at playing together.

Clash On!
The Clash of Clans Team

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We’ve been reading and listening to your reactions about Friendly Challenges, both positive and negative. Based on your feedback, we’ve made a couple of tweaks.

Layout Replacing Restrictions

       Your feedback about how Friendly Challenges might affect Clan War dynamics was super helpful. What makes Clan Wars exciting is the pressure of getting an attack right the first time. Using the new feature to endlessly practice attacks would replace one-shot attacking skill with endless, grindy repetition.

To address this, layouts modified within the last 24 hours will not be available for Friendly Challenges if you are Town Hall 9 or above. Town Hall 8 and below will not have any restrictions.

Changes to War Preparation Day

In order to make the Layout cooldown 24-hours, we will also change how Scouting works on Preparation day.

After the update, you will no longer be able to view an opponent’s War Base layout during Preparation Day. Instead, Scouting will show their active Village layout. This way, players can still get a good sense for the strength of War Bases they are facing, but can’t copy exact layouts for practice. Scouting during Battle Day will remain the same.

Why do this? Without this change to Scouting, the Friendly Challenge cooldown would have to be 48-hours to prevent any possibility of "war practice.” 
 

Your feedback was crucial to helping us make these changes, so thank you and keep it coming!

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