The ability to modify your strategy in response to the cards you are dealt and the cards your opponents are playing is another essential skill for successek rummy in the game of Rummy. Making Vigorous Choices. In addition to having faith in your skills, having a winning mindset also entails making wise choices during the game. In order to create successful sets & runs, you must be able to swiftly evaluate your hand and decide which cards to keep & which to discard.