Given the task definition and input, reply with output. Given a text passage, come up with an appropriate title for it. The title should accurately represent what the main focus of the passage is. The title of a passage may be present in the first few sentences of the passage and/or be referred to multiple times in the passage. The title should be 1-5 words long.

In 2004 , Harrah 's Entertainment ( now Caesars Entertainment ) purchased Binion 's Horseshoe , retained the rights to the Horseshoe and World Series of Poker brands , sold the hotel and casino to MTR Gaming Group , and announced that the 2005 Series events would be held at the Harrah 's - owned Rio Hotel and Casino , located just off the Las Vegas Strip . The final two days of the main event in 2005 were held downtown at what is now the MTR - operated '' Binion 's '' in celebration of the centennial of the founding of Las Vegas . The WSOP also added a made - for - television $2 million '' freeroll '' invitational Tournament of Champions ( TOC ) event first won by Annie Duke as a '' winner - take - all '' event .
World Series of Poker