And it was a simple one.
According to the Hammers boss, all he had to do was switch Stewart Downing from out wide into the hole again, where he was 'outstanding.' From 2-0 down, the east London side then salvaged a point after coming back to secure a 2-2 draw.
"It was a point that was well-earned and maybe not deserved but that's the way the Premier League is," Allardyce told reporters after the match.
"We haven't played as well as we want to but we have got something out of the game, which speaks major volumes for the character of this team.
"Downing was outstanding He has flourished in the hole again.
"We started with him out wide, but once we brought him back into the middle again he started getting into the areas much better and was much more dangerous."
So what does that mean for the 30-year-old, then?
His ability from midfield has been clear all season but is he not cut out as a wide man anymore?
Interestingly, despite moving back into the centre, West Ham's first goal still came from a Downing cross out wide. The likelihood is, though, that the Hammers man will start from the middle in his next game against Aston Villa.