Usage:

For example, in jacks or better, the opener must have already in his hand at least a pair of jacks. Someone in next-to-last position in an unopened pot might have four cards to a straight flush and dearly like to open the pot. If he does, he is said to have false openers. Usually the opener of a pot has to show openers. If he cannot prove he had openers, the player cannot win the pot.