Poker champ Annie Duke on gut instincts and bluffing.

Annie Duke, one of the world’s top professional poker players, is an excitable fast-talker, a shameless flirt, and an affectionate mother of four children. And when she’s at the poker table, Duke, 41, is an enigma who crunches numbers while divining her opponents’ intentions. In 1991, she impulsively dropped out of a Ph.D. program in cognitive psychology to play cards for money and ran off to Montana to marry a friend she’d never even dated. Her gamble paid off in 2004, when she nabbed the $2 million prize at the World Series of Poker in Las Vegas….