The top 8 teams from all the four sub-groups of the Elite and Plate Groups in the Ranji Trophy, 2005-06 were promoted to the knock out level of the tournament. The BCCI promoted the teams on the basis of the points that they earned from their respective group matches and the top two teams from each of the sub-groups got the promotion. The teams included the likes of Bengal, Baroda, Mumbai, Uttar Pradesh, Rajasthan, Orissa, Saurashtra and Madhya Pradesh. The first four teams played against each other in the Elite Group knock out matches with the aim of winning the coveted championship title of the Ranji Trophy, 2005-06. On the other hand, the rest of the four teams played in the Plate Group knock out matches for claiming one of the top two spots in the Plate Group. The teams tried so because the top two teams of the Plate Group got the promotion to the Elite Group in the next year`s edition.

The first of the knock out matches in the Ranji Trophy, 2005-06 was the first Semi-Final match of the Plate Group in the Ranji Trophy, 2005-06 and the teams of Rajasthan and Orissa were involved in the match. The match was held at Jaipur from 25-27 January, 2006 and it saw the Rajasthan team winning by a huge margin of 9 wickets. The Rajasthan team also entered into the Plate Group Final by winning this match. In the second Semi-Final match of the Plate Group in the Ranji Trophy, 2005-06, the teams of Saurashtra and Madhya Pradesh played against each other at Rajkot from 25-29 January, 2006. The match remained drawn during the specified period of time and the match officials allowed the Saurashtra team to advance to the Final of the Group. Thus, the Rajasthan and Saurashtra teams locked their horns together in the Final match of the Plate Group in the Ranji Trophy, 2005-06 and the two teams played the match at Rajkot from 02-05 February, 2006. The Saurashtra team won the match by a good margin of an innings and 34 runs and also became the Plate Group Champion in the Ranji Trophy, 2005-06. The Rajasthan and Saurashtra teams also got the permission to play in the Elite Group of the next year`s edition of the tournament.

In the Elite Group, the teams of Bengal and Baroda played against each other in the first Semi-Final match of the Elite Group in the Ranji Trophy, 2005-06 and the two teams played the match at Kolkata from 20-24 January, 2006. The match remained drawn during the stipulated duration and the Bengal team got the permission to play in the Final of the tournament. The second Semi-Final match of the Elite Group in the Ranji Trophy, 2005-06 involved the teams like Mumbai and Uttar Pradesh and the match was held at Mumbai from 20-23 January, 2006. The Uttar Pradesh beat the Mumbai team by a good margin of 5 wickets in the match and set up a clash with the Bengal team in the Final of the group. Thus, the Final match of the Elite Group in the Ranji Trophy, 2005-06 saw the Bengal and Uttar Pradesh teams playing against each other at Lucknow from 29 January-02 February, 2006. Both the teams played nicely in the match and as a result, the match went on to be a drawn one after the specified period of time. However, the match officials declared the Uttar Pradesh team as the winner of the match as well as the championship title, as it was having a lead in the first innings of the Final match.