The tournament that ran from 20 December 2016 to 28 January 2017 caused a break in what Austrailian Competition?
2016–17 Sheffield Shield season: The 2016–17 Sheffield Shield season was the 115th season of the Sheffield Shield, the domestic first-class cricket competition in Australia. 2016–17 Big Bash League season:  The tournament ran from 20 December 2016 to 28 January 2017.
i don't know