Celtic held by Arbroath
A review of Saturday's action in the Scottish Cup fourth round, including a shock draw between Celtic and Arbroath.
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Steven Doris' dramatic late free-kick for Arbroath means Celtic will have to replay their William Hill Scottish Cup fourth-round tie against the third-tier side following a 1-1 draw at Parkhead.
With one eye on Wednesday night's home Champions League Group G decider against Spartak Moscow, Hoops manager Neil Lennon made nine changes to his side.
The hosts nevertheless went ahead in the 35th minute when Stewart Malcolm hammered a clearance from the byline off the back of fellow Red Lichties defender Alex Keddie and into the net.
The SPL champions created and missed a host of chances while also being foiled by Arbroath goalkeeper Scott Morrison, but with four minutes remaining Doris shocked the home side when his deflected drive beat Lukasz Zaluska in the Celtic goal.
Aberdeen's Niall McGinn continued his predatory form this season as he headed home a last-minute equaliser to earn Aberdeen a 1-1 draw against Motherwell.
It had for the most part been an even match between the two SPL sides, with Motherwell taking the lead through Jamie Murphy's superb strike with 10 minutes remaining.
A goal in each half from Cillian Sheridan and Borja Perez was enough to see Kilmarnock into the next round as they beat Queen of the South 2-1.
The plucky visitors, who played 88 minutes with 10 men after Stevie McKenna saw red, made them fight all the way, especially in the closing stages after Nicky Clark pulled a goal back with 13 minutes remaining.
First half goals from Steven Milne and Ryan Conroy booked Dundee's place in the fifth round as they overcame hosts Livingston 2-0.
Milne put the SPL side ahead with a turn and shot nine minutes into an entertaining first half, while Conroy doubled their advantage from the penalty spot.
Livingston felt they should have had a spot kick of their own shortly afterwards, but despite dominating possession in the second half they were unable to net a reply.
St Mirren progressed to the fifth round with a comfortable 2-0 victory over Brechin City.
The Buddies controlled the early exchanges and were rewarded when Kenny McLean opened the scoring with a well struck free-kick just after the half-hour mark.
And Jon Robertson added a second with a wonderful volley four minutes before half-time.
A dominant first-half performance from Dundee United ensured they made comfortable work of Stranraer with a 5-0 victory.
The SPL side made the trip to Stair Park keen to avoid a potential upset and never looked in any danger as Johnny Russell's hat-trick and a brace from Jon Daly secured a routine win.
In the early game, Richie Foran scored in the fifth minute of added time as Inverness snatched a 3-3 draw in a six-goal cup tie thriller against Ross County.
Ross also scored in added time as the lead changed back and forth in a tie which will have to go to a replay.
Billy McKay had put the visitors ahead at the Global Energy Stadium on the half hour only for Rocco Quinn to equalise four minutes into the second half.
Foran put Caley back in front with 16 minutes to go back County were level again when Iain Vigurs netted with four minutes left on the clock.
Richard Brittain put the home side ahead for the first time in the second minute of added time but Foran ensured the spoils were shared.
St Johnstone's Scottish Cup tie at Cowdenbeath was postponed until Tuesday because of a frozen pitch.