Ross County held Scottish Premiership champions Celtic to a 1-1 draw at Parkhead on Saturday.
Melvin De Leeuw gave Derek Adams' side the lead but Kris Commons equalised before the break.
Aberdeen hit back to draw 1-1 with Dundee United at Pittodrie. Paul Paton had the visitors in front early on but Niall McGinn levelled in 52 minutes.
Kilmarnock beat third-placed Motherwell 2-1 at Fir Park to boost their hopes of avoiding the relegation play-offs. Iain Vigurs scored in the first half but Rory McKenzie hauled Killie level and Craig Slater grabbed the winner deep into stoppage time.
Inverness CT and St Mirren shared the spoils in a 2-2 draw in the Highlands. Ross Draper and Greg Tansey overturned Jason Naismith's early goal but Sean Kelly earned Saints a point before Caley Thistle's Josh Meekings was sent off.
Kris Doolan netted a last-minute equaliser as Partick Thistle claimed a 1-1 draw at St Johnstone, who had gone ahead through an early Stevie May goal.
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