RCB has zero chance, IMO because they have played 11 matches and won 4 only while CSK, MI, DC has already won 7 matches. Even if RCB win all the match, their NRR will get them out from the tournament.
They still have a chance, but they need to win all of their remaining games and other teams need to lose. A miracle is required and I have observed such miracles in the IPL in the past which is why I would not rule them out just yet.
2 knockout matches today. This is going to be fun.