Can I attack a specific player?

You cannot attack specific players, you can only attack

• Who you find random.
• Someone who attacked you and you tap "revenge" (not available if that player attacked you out of revenge)
• Enemies in a clan war.

As of the recent update, you can now practice attack members from your own clan's bases. These attacks (friendly challenges) can be done whenever you wish, and as often as you like. You may use any of your available base layouts to challenge people, so you can test different layouts and see which works best, or test different attack strategies out to get better at them without wasting any troops. These challenges will not grant and loot/trophies, nor will the troops used be destroyed, so you can reuse the troops for as many challenges as you wish.