Don't play without a system, any system! Unless you play for fun.

Basically a form of poker in which each player is dealt two cards face down, called hole cards. The player may then use none, one, or both of his hole cards, in combination with five board cards or community cards dealt face up, to make the best possible five-card hand.

The subject of gambling is all encompassing. It combines man's natural play instinct with his desire to know about his fate and his future. ~Franz Rosenthal, Gambling in Islam, 1975