I agree with this set of games

that also play chess and poker. I want to choose an ordinary part of these games:
- you must know theory better game (can we say about each game, but in this game it is the most important)
- you can play simple strategy (ABC Poker and Chess free openings for example)
- chess games and heads-up
These are different games, but keeping you in one of them makes your growth in another. Play both and will have high chess and poker skill!
BTW, good luck in the shaft becomes more important when you have less time to play - blitz and bullet versions have more luck than classical chess. Bullet chess has even more luck poker sometimes