| At Cardiff City (24) | | At Reading (22) | | Results | Total | % | | Results | Total | % | | Cardiff City | 12 | 50.00 | | Reading | 11 | 50.00 | | Reading | 7 | 29.17 | | Cardiff City | 4 | 18.18 | | Draws | 5 | 20.83 | | Draws | 7 | 31.82 | | Goals | Total | Av.pg | | Goals | Total | Av.pg | | Cardiff City | 52 | 2.17 | | Reading | 42 | 1.91 | | Reading | 27 | 1.13 | | Cardiff City | 19 | 0.86 | | On Neutral Ground (1) | | Overall (47 matches) | | Results | Total | % | | Results | Total | % | | Cardiff City | 1 | 100.00 | | Cardiff City | 17 | 36.17 | | Reading | 0 | 0.00 | | Reading | 18 | 38.30 | | Draws | 0 | 0.00 | | Draws | 12 | 25.53 | | Goals | Total | Av.pg | | Goals | Total | Av.pg | | Cardiff City | 3 | 3.00 | | Cardiff City | 74 | 1.57 | | Reading | 0 | 0.00 | | Reading | 69 | 1.47 |
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| Records | | Highest Aggregate | 6 | Reading | 5 - 1 | Cardiff City | 2005/2006 | | Highest Cardiff City score: | 5 | Cardiff City | 5 - 0 | Reading | 1930/1931 | | Highest Reading score: | 5 | Reading | 5 - 1 | Cardiff City | 2005/2006 |
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| Season | Date | Home | Score | Away | Competition | | 2005/2006 | Mon 02 Jan | Reading | 5 - 1 | Cardiff City | Championship | | 2004/2005 | Sat 23 Apr | Cardiff City | 2 - 0 | Reading | Championship | | Sat 13 Nov | Reading | 2 - 1 | Cardiff City | Championship | | 2003/2004 | Tue 16 Mar | Cardiff City | 2 - 3 | Reading | League Division One | | Tue 16 Sep | Reading | 2 - 1 | Cardiff City | League Division One | | 2001/2002 | Wed 26 Dec | Cardiff City | 2 - 2 | Reading | League Division Two | | Sat 08 Sep | Reading | 1 - 2 | Cardiff City | League Division Two | | 1999/2000 | Sat 25 Mar | Reading | 0 - 1 | Cardiff City | League Division Two | | Sun 26 Dec | Cardiff City | 1 - 0 | Reading | League Division Two | | 1997/1998 | Tue 03 Feb | Reading | 1 - 1 | Cardiff City | F.A. Cup | | after extra time, 90 minutes 1-1, Reading won 4-3 on penalties | | Sat 24 Jan | Cardiff City | 1 - 1 | Reading | F.A. Cup | | 1993/1994 | Sat 09 Apr | Reading | 1 - 1 | Cardiff City | League Division Two | | Sat 01 Jan | Cardiff City | 3 - 0 | Reading | League Division Two | | 1989/1990 | Tue 01 May | Cardiff City | 3 - 2 | Reading | Third Division | | Sat 14 Apr | Reading | 0 - 1 | Cardiff City | Third Division | | 1988/1989 | Sat 18 Feb | Reading | 3 - 1 | Cardiff City | Third Division | | Sat 08 Oct | Cardiff City | 1 - 2 | Reading | Third Division | | 1985/1986 | Sat 11 Jan | Reading | 1 - 1 | Cardiff City | Third Division | | Sat 31 Aug | Cardiff City | 1 - 3 | Reading | Third Division | | 1982/1983 | Tue 01 Mar | Cardiff City | 0 - 0 | Reading | Third Division | | Wed 03 Nov | Reading | 1 - 2 | Cardiff City | Third Division | | 1965/1966 | Wed 03 Nov | Cardiff City | 5 - 1 | Reading | League Cup | | 1962/1963 | Wed 26 Sep | Cardiff City | 5 - 1 | Reading | League Cup | | 1946/1947 | Sat 05 Apr | Reading | 0 - 0 | Cardiff City | Third Division (South) | | Wed 22 Jan | Cardiff City | 3 - 0 | Reading | Third Division (South) | | 1938/1939 | Wed 01 Feb | Reading | 0 - 0 | Cardiff City | Third Division (South) | | Sat 17 Sep | Cardiff City | 0 - 1 | Reading | Third Division (South) | | 1937/1938 | Wed 04 May | Reading | 0 - 0 | Cardiff City | Third Division (South) | | Sat 23 Apr | Cardiff City | 4 - 1 | Reading | Third Division (South) | | 1936/1937 | Sat 06 Feb | Cardiff City | 1 - 1 | Reading | Third Division (South) | | Sat 03 Oct | Reading | 3 - 0 | Cardiff City | Third Division (South) | | 1935/1936 | Sat 04 Jan | Reading | 4 - 1 | Cardiff City | Third Division (South) | | Sat 07 Sep | Cardiff City | 2 - 3 | Reading | Third Division (South) | | 1934/1935 | Sat 16 Mar | Cardiff City | 1 - 1 | Reading | Third Division (South) | | Sat 24 Nov | Cardiff City | 1 - 2 | Reading | F.A. Cup | | Sat 03 Nov | Reading | 1 - 1 | Cardiff City | Third Division (South) | | 1933/1934 | Wed 06 Sep | Reading | 3 - 1 | Cardiff City | Third Division (South) | | Mon 28 Aug | Cardiff City | 2 - 0 | Reading | Third Division (South) | | 1932/1933 | Sat 31 Dec | Cardiff City | 0 - 1 | Reading | Third Division (South) | | Sat 27 Aug | Reading | 4 - 2 | Cardiff City | Third Division (South) | | 1931/1932 | Sat 16 Jan | Reading | 5 - 1 | Cardiff City | Third Division (South) | | Sat 05 Sep | Cardiff City | 5 - 1 | Reading | Third Division (South) | | 1930/1931 | Sat 14 Mar | Reading | 3 - 0 | Cardiff City | Second Division | | Sat 08 Nov | Cardiff City | 5 - 0 | Reading | Second Division | | 1929/1930 | Mon 21 Apr | Reading | 2 - 0 | Cardiff City | Second Division | | Fri 18 Apr | Cardiff City | 2 - 1 | Reading | Second Division | | 1926/1927 | Sat 26 Mar | Cardiff City | 3 - 0 | Reading | F.A. Cup | | played at Wolverhampton |
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