Rangers score two second half goals to beat Celtic in Scotland 's Old Firm Derby . Steven Naismith on target in each half for Rangers who go three points clear at top in Scotland . Celtic have David Mulgrew sent off in the second half for second bookable offence . not sure we deserved to go in 2-1 down Old Firm Derby is one of the most hotly - contested in Scottish football .
Rangers score two second half goals to beat Celtic in Scotland 's Old Firm Derby . Steven Naismith on target in each half for Rangers who go three points clear at top in Scotland . Celtic have David Mulgrew sent off in the second half for second bookable offence . Old Firm Derby is one of the most hotly - contested in Scottish football .