
The Black Cats only had one available striker available in Asamoah Gyan, but it was Richardson, who played just behind the Ghana international at Bloomfield Road that was causing the trouble.
Gyan set Richardson up in the 15th minute to make it one - nil and he doubled the lead nine minutes later after running onto Steed Malbranque's pass and placing it nicely past Richard Kingson in the Blackpool net.
Sunderland dominated most of the match but a somewhat dubious penalty decision gave the Tangerines a reply, which rallied Ian Holloway's men to look for an equaliser, but couldn't find a way past Craig Gordon.
The match wasn't a dirty one, but three Blackpool players were unfortunate to suffer head injuries, including Goalkeeper Kingson, who was forced off in the 56th minute and replaced by Paul Rachubka.
Steve Bruce will without a doubt bring in a striker before the transfer window slams shut, but has refused to "panic buy" after praising Gyan and Richardson for their efforts following Bent's £18 million transfer to Aston Villa.
Sunderland have a week off next weekend as the FA cup 4th round takes place but will host champions Chelsea a week on Tuesday, hoping to repeat their 3-0 success last time round at Stamford Bridge.