Once a year the world's poker elite assemble in Las Vegas for the Big One.

Binion's Horseshoe. The 31st Annual World Series of Poker.
29 days, 25 events, $1.5 million first prize.

Upstairs from the main casino is a huge room with no daylight
and a steady drone of chips being riffled, like mad cicadas.

A knife edge of sustained patience and aggression.