Question: In which league did this professional minor league ice hockey team, which Knoxville Ice Bears played against at the final, play in 2010?

full_context: Document 1: River East Royal Knights: The River East Royal Knights are a junior ice hockey team in the Manitoba Major Junior Hockey League. Based out of Winnipeg, Manitoba, Canada, the Royal Knights play their home games at Terry Sawchuk Memorial Arena.
Document 2: Mississippi RiverKings: The Mississippi RiverKings are a professional minor league ice hockey team. The RiverKings are a member of the Southern Professional Hockey League, playing their first nineteen seasons from the 1992–93 season to the 2010–11 season in the Central Hockey League. In July 2007, after 15 seasons as the Memphis RiverKings, the name was changed to Mississippi RiverKings. The RiverKings are the oldest continuously operating professional sports franchise in the Memphis Metropolitan Area.
Document 3: Peoria Rivermen (SPHL): The Peoria Rivermen are a professional ice hockey team in the Southern Professional Hockey League. They play in Peoria, Illinois, United States at the Carver Arena. The team replaced an American Hockey League franchise of the same name that was purchased by the Vancouver Canucks and moved out of Peoria to Utica, New York.
Document 4: Knoxville Ice Bears: The Knoxville Ice Bears are a professional ice hockey team. The team competes in the Southern Professional Hockey League. They play their home games at the Knoxville Civic Auditorium and Coliseum in Knoxville, Tennessee. The Ice Bears are coached by Mike Craigen, currently in his 5th season as head coach. The Ice Bears have made the playoffs in all 14 years of their existence. In 2006, the Ice Bears defeated the Florida Seals to take their first President's Cup. The Ice Bears won back to back President's Cup Championships in the 2007-08 and 2008-09 seasons. On April 18, 2015, the Ice Bears defeated the Mississippi RiverKings 4-2 to sweep the 2015 SPHL Finals and win their 4th President's Cup.
Document 5: Mississippi Beach Kings: The Mississippi Beach Kings were an indoor soccer team based in Biloxi, Mississippi. They played their games in the Mississippi Coast Coliseum. They were members of the Eastern Indoor Soccer League and played only during the 1998 season. During the 1997 season, the team played in Columbus, Georgia as the Columbus Comets.
Document 6: 2014–15 Ukrainian Hockey Championship: The 2014–15 Ukrainian Hockey Championship was the 23rd season of the Ukrainian Hockey Championship. Only four teams participated in the league this season, because of the instability in Ukraine and that most of the clubs had economical issues. Generals Kiev was the only team that participated in the league the previous season, and the season started first after the year-end of 2014. The regular season included just 12 rounds, where all the teams went to the semifinals. In the final, ATEK Kiev defeated the regular season winner HK Kremenchuk.
Document 7: Southern Professional Hockey League: The Southern Professional Hockey League (SPHL) is a professional ice hockey league based in Huntersville, North Carolina, with teams located primarily in the southeastern United States as well as Illinois and Indiana in the midwestern United States.
Document 8: 2010–11 Mississippi RiverKings season: The 2010–11 Mississippi RiverKings season was the 19th season of the Central Hockey League (CHL) franchise in Southaven, Mississippi.
Document 9: Minnesota Fighting Saints: The Minnesota Fighting Saints was the name of two professional ice hockey teams based in Saint Paul, Minnesota that played in the World Hockey Association. The first team was one of the WHA's original twelve franchises, playing from 1972–76. The second team was relocated from Cleveland, Ohio, and played for part of the 1976–77 season. Neither edition of the franchise completed its final season of play.
Document 10: Mississippi Sea Wolves: The Mississippi Sea Wolves were a professional hockey team based in Biloxi, Mississippi and playing in the Mississippi Coast Coliseum. The Sea Wolves were members of the ECHL.
Document 11: 2014–15 SPHL season: The 2014–15 SPHL season was the 11th season of the Southern Professional Hockey League (SPHL). The Knoxville Ice Bears defeated the Mississippi RiverKings in the President's Cup final 2 games to none to win their 4th SPHL title.
Document 12: Peoria Rivermen (IHL): The Peoria Rivermen were an ice hockey team that played in the International Hockey League. They played in Peoria, Illinois at the Carver Arena. A new team with the Peoria Rivermen name currently competes in the Southern Professional Hockey League.
Document 13: 2014–15 Chicago Blackhawks season: The 2014–15 Chicago Blackhawks season was the 89th season for the National Hockey League franchise that was established on September 25, 1926. The Blackhawks finished the season with a 48–28–6 record, finishing in third place in the Central Division. They defeated the Nashville Predators in the first round of the Stanley Cup Playoffs 4 games to 2. In the next round, they swept the Minnesota Wild 4 games to 0. In the Western Conference Finals, the Hawks outlasted the Anaheim Ducks, winning the series 4 games to 3. In the Stanley Cup Final, they faced the Tampa Bay Lightning. On June 15, 2015, the team won the Stanley Cup, beating the Lightning 4 games to 2, and winning the Cup at home for the first time since 1938. This was the Blackhawks' third Cup championship in six seasons. Duncan Keith received the Conn Smythe trophy as MVP of the playoffs.
Document 14: Landers Center: The Landers Center is an 8,400-seat multi-purpose arena in Southaven, Mississippi. It was built in 2000. It is home to the Mississippi RiverKings, a team in the Southern Professional Hockey League.
Document 15: 2003–04 Knoxville Ice Bears season: The Ice Bears first off-season was an eventful one. First, the Atlantic Coast Hockey League folded, and the Ice Bears moved to the newly formed South East Hockey League. Then, head coach Tony Martino left to coach Italian team HC Varese. He was replaced by Jim Bermingham, a 10-year pro who played his final season in Knoxville during the Ice Bears inaugural campaign. General Manager Tommy Benizio was let go and replaced with assistant coach Preston Dixon, who also retained his coaching position.
ground_truth: Central Hockey League