We paid for ref indecision - Smith

Miller sliced a shot wide of the target from 12 yards out after being set up by Steven Davis before he was felled by his fellow Scotland international. Murray, taking charge of his first Old Firm game, ignored pleas for a spot-kick but Smith insists the official would have adjudicated differently if the incident had happened outside the box.

"If it happens in any other area of the pitch then the referee gives the foul," Smith said.

He continued: "If it is in the penalty area then he has a couple of decisions to make and obviously he chose not to make them.

"Kenny Miller had shot past and it was a late challenge but we never got it.

"But we had a couple of other opportunities that Artur Boruc saved."

Celtic striker Scott McDonald missed the chance of the game in the first half when he failed to connect properly with a Willo Flood cross just six yards out and it was his side's first-half inertia that irked the Rangers boss.

"It was one of the poorest first-half performances that we've had away from home this season," Smith said.

"We didn't play well, the possession was poor and they had the one opportunity with Scott McDonald.

"But if you come to Celtic Park and Celtic only have a Shunsuke Nakamura free-kick as their only real attempt on goal, then your team are doing something right."