Board Thread:Game Discussions/@comment-24149689-20140109105146/@comment-24317058-20140109230835

the 0/20 is do-able without gems, takes some time though.. If you reach the 27,000(if im right) milestone in Tournament A, you get 5 energy, assuming you already had your energy maxed this stacks up to 10. Wait for Tournament B to start.

Starting tournament B with 10 energy will be enough to get you 600 points, giving you another 5 energy as a milestone reward. 6 wins in a row will also give you 2 energy (which gives you 17 wins). Timing your attacks can get you to like a 22-23 winstreak.