Zesco United’s lead has been cut from eight to six points after they were held away by their nemesis Nkwazi on Wednesday.
The leaders and defending champions failed to breach 11th placed Nkwazi to finish 0-0 away at Edwin Embolea Stadium in Lusaka and are still without league win against the Policemen on the road since 2010.
Zesco have 74 points with four games left to play but are looking in their rear view mirror where Nkana are now a strong second following a 2-0 away win over second from bottom Nchanga Rangers in Chingola.
Shadreck Malambo and Walter Bwalya scored in the 2nd and 65th minutes to see Nkana rise to 68 points.
Green Buffaloes tumbled from third to fourth after they lost 1-0 at home to Kabwe Warriors, exchanging places with Green Eagles on goal difference on 65 points who drew 1-1 at home in Choma with National Assembly.