Sergio Aguero of Manchester City celebrates scoring against Arsenal during their English League Cup soccer match at Emirates Stadium in London, Nov 29, 2011. [Photo/Agencies]

LONDON - Manchester City edged past Arsenal and Liverpool beat Chelsea to reach the League Cup semi-finals on Tuesday while Cardiff City also made the last four on an emotional night in south Wales.

Premier League leaders City won at Arsenal for the first in 36 years with a late goal by Sergio Aguero earning a 1-0 victory against a much-changed home side in front of a 60,000 crowd.

Maxi Rodriguez and Martin Kelly scored in the second half as Liverpool beat struggling Chelsea 2-0 - their second win at Stamford Bridge in 10 days - to heap more pressure on the west London side's Portuguese manager Andre Villas-Boas.

Blackburn Rovers' dismal season took another turn for the worse when the Premier League's bottom club lost 2-0 at Championship (second division) side Cardiff City, who have reached the semi-finals for the first time since 1966.

Park Chu-young (R) of Arsenal evades the challenge of Nedum Onuoha (L) of Manchester City during their English League Cup soccer match at Emirates Stadium in London, Nov 29, 2011. [Photo/Agencies]

Manchester United host another Championship side, Crystal Palace, at Old Trafford on Wednesday.

It was a poignant night in the Welsh capital with a ceremony in memory of Wales manager Gary Speed held before kickoff after his death on Sunday.

There was also a minute's silence at The Emirates for Speed with spontaneous applause breaking out for the former Leeds United, Everton, Newcastle United and Bolton Wanderers midfielder who was found hanged at his home in Cheshire.

City manager Roberto Mancini shuffled his squad but still fielded a side packed with internationals including former Arsenal midfielder Samir Nasri who was roundly booed by the home fans whenever he touched the ball.

Arsenal were the more lively side but struggled to create many clear chances with Alex Oxlade - Chamberlain and Park chu-Young having their best attempts in the first half.

City had not managed an effort on target until the 83rd minute when Edin Dzeko set Adam Johnson away after an Arsenal corner was cleared and the ball was eventually threaded through to Aguero to fire in his 12th goal of the season.