After four days of paced, measured play in the $50,000 HORSE event, it's a bit unsettling to watch the fortunes change so drastically. The blinds and limits are such that one or two close hands can take a player from the top to the bottom in no time at all.

Witness the fall of Daniel Negreanu. At the dinner break, Negreanu sat near the top of the leader board. Moments ago, he walked out in 13th place.

As has been mentioned more than a few times, Negreanu helped serve as the inspiration for this event's creation. After winning his bracelet earlier this Series in the $2,000 Limit event, Negreanu aimed to win his fifth. This looked to be one of his best opportunities.

Instead, his 13th place finish earns him $142,080 and the opportunity to play in tomorrow's $10,000 Pot-Limit Omaha World Championship.

At this hour, Barry Greenstein is the only member of Team PokerStars Pro remaining in the $50,000 HORSE event. His fortune hasn't been much better in the last couple of hours. His girlfriend Alex described the past several hours with one word: "Rollercoaster"

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While we look for a bit better news to report, Joe Hachem has some ideas about how to balance math and instinct in big poker events. Check it out the video blog below.

Watch WSOP 08: Joe Hachem On Math on PokerStars.tv