"I am going to have a nice cold beer to celebrate," Allardyce said after the victory.
"We started with a 4-4-2 system for the first time this season and it gave the lads a bit more freedom to express themselves.
"It was a magnificent victory and it gives me a lot of pleasure especially after the way we have been beaten by Everton in midweek.
"We found some quality finishing, which has been lacking since Boxing Day when we also got four goals against Newcastle.
"There was distance between ourselves and Birmingham before the start of the game but now we have exerted pressure on them.
"Hopefully we can drag them into the bottom four but we have got to keep our feet on the ground and continue to work hard."
Birmingham Match Report