Defender Filip Helander scored the only goal midway through the second half as Rangers defeated Celtic 1-0 at Ibrox in the first Old Firm game of the season.
Christian Ramirez grabbed a late equaliser as Aberdeen drew 1-1 with Ross County at Pittodrie - the Staggies had gone ahead through Regan Charles-Cook.
St Mirren had Ethan Erhahon sent off in stoppage time as it finished 0-0 against St Johnstone at the SMiSA Stadium.
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