Anil Kumble ( pronunciation  born 17 October 1970) is an Indian former cricketer and a former captain of Tests and ODIs, who played Tests and ODIs for 18 years. A right-arm leg spin (leg break googly) bowler, he took 619 wickets in Test cricket and remains the third-highest wicket taker of all time (as of 2018, behind Muttiah Muralitharan and Shane Warne). Unlike his contemporaries, Kumble was not a big turner of the ball, but relied primarily on pace, bounce, and accuracy.

Kumble agreed to honour his contract with the Royal Challengers Bangalore (RCB) franchise of the Indian Premier League after retirement. He was given a three-year contract worth US$500,000 per year in the first round of bidding in 2008.  On 18 April 2009 he took a five-wicket haul conceding just 5 runs against the defending champions Rajasthan Royals, which helped RCB get a 75-run victory in the second match of the 2009 edition, played in South Africa. After the departure of Kevin Pietersen for England's cricket commitments, Kumble was named as the captain of the Royal Challengers. On 23 May 2009 his team defeated the Chennai Super Kings by six wickets and got a spot in the final against the Deccan Chargers. Though RCB could not win the tournament, Kumble ended as the most successful spin bowler and the 2nd highest wicket-taker of the tournament with 21 wickets at an economy rate of 5.86 runs per over behind R. P. Singh.  In 2010 Indian Premier League, Kumble led the team to the semi-finals. After being forced to play their semi-finals at the DY Patil Stadium following security concerns in Bangalore, the Royal Challengers lost their semi-final to the Mumbai Indians with Kumble taking 1 wicket at an economy rate of 7.50 in the match.  Kumble announced his retirement from Indian Premier League on 4 January 2011. After his retirement from IPL as a player, RCB appointed him as the chief mentor for the team. Kumble left that position in January 2013, moving to a similar role with the Mumbai Indians, which he quit in November 2015.

Answer the following question by taking a quote from the article: what was the ipl?
Indian Premier League,