The battle between the DUP and Sinn Féin to be the largest Stormont party after May's election is shaping up to be a question of which will lose more seats.
Just one seat separated the big two in the last Assembly election in 2017, with the DUP returning 28 MLAs to Sinn Fein's 27.
But successive opinion polls suggest that for both parties their vote share has dropped compared to five years ago.
