Kosowski is the Dude
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Level 20
: 3,000/6,000, 1,000 ante

Play has slowed somewhat as we approach the end of Level 20 and the next scheduled break. The 30 remaining players are becoming quite chatty, all understandably feeling good about their having made it to the money, and continuing to have a chance at the larger paydays awaiting those who make the final table.
Those sitting at Mike Kosowski's table -- after a long time wondering, it appears -- have finally figured out why he looks familiar to them.
"No way... You're the dude who beat Negreanu!" cried one, recognizing him from his 2009 Million Dollar Challenge appearance (noted here). "I knew I recognized you!"