<P> 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 . </P>
<P> 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 . </P>
when did the wsop move to the rio
when did the wsop move to the rio
2005
2005