In the Clash Royale game, you are able to get Tournament Chests by reaching the higher ranking in a Tournament.
If you can get close to the end of a competition and become one of the top 3 players, you will receive those chests with a mixed number of cards which depend on the size of the Tournament.
Aside from that, the second prize chest will provide 2/3 the number of cards of the biggest one, which can consist of guaranteed Legendary cards.
Meanwhile, the third one will include 1/2 the number of cards of the biggest chest.
If you engage large Tournaments, you can see that players in the top 50% always get an award. In smaller Tournaments, fewer people will have a prize (40%-45% players in the top). So, you will know that the better rank will bring back the higher amount of cards.
The Clash Royale Tournament Chest will be automatically unlocked after the Tournament is finished. It takes 14 days to open the most important one. Gems can help you easily open it and you can skip that step.
Before trying any other Tournament, remember to unbolt chests.
Currently, Tournament Chests also hold Gold.
The contents of cards in the Tournament Chest have the similar rules of the Magical Chest or Super Magical Chest: 1 Rare for 5 Commons and 1 Epic for 30 Commons.