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David Einhorn flush with luck in poker's 'Main Event'

Greenlight Capital President David Einhorn sits at a poker table in Atlantic City, N.J.
Scott Eells | Bloomberg | Getty Images

Billionaire hedge fund manager David Einhorn is still alive after three days (and nearly 30 hours of play) in the World Series of Poker Main Event in Las Vegas.

The head of Greenlight Capital is one of 6,683 players who put up the $10,000 tournament entry for a shot at the $10 million first prize.

Some 746 players remain, and on Friday the so-called money bubble will burst. Only 693 players will make the money, with the minimum cash being worth $18,406. The lucky player in 694th place gets free entry into next year's tournament; 695th gets nothing.

Currently Einhorn has 174,500 chips (from a starting stack of 30,000 on Day 1) putting him right in the middle of the pack.

Read MorePoker pros not alone in 'Big One' tourney stake

If Einhorn survives the day there are still three more to go, and on Monday the tournament will play down to the nine players who will play the final table in November.

This is not Einhorn's first deep run in the Main Event. In 2006 he finished 18th out of 8,773 in what is still the biggest live tournament in poker history. He earned a prize of $659,730.

In 2012, Einhorn took third place in the first "Big One for One Drop" tournament, which has a $1 million buy-in. That paid $4,352,000.

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This year he didn't fare as well in the Big One, busting in the first hour.

But the money doesn't much matter to Einhorn as he has always donated his tournament poker winnings to charity.

High-end, high-stakes poker ring

Einhorn has been tweeting often about his adventures in Las Vegas but you may need a poker-to-English dictionary to follow him.

He ended his final tweet of the night with "back for more in the morning." If he can keep saying that for a few more days, some very lucky charity is going to get a nice donation.

Einhorn tweet

—By CNBC's Paul Amin