Masari used Sumokoin's algo which is:
next_D=avg(17 D) / (0.8*avg(17 ST) + 0.3*median(17 ST)
ST=solvetimes. The 17 D and ST were 6 blocks behind most recent block. There is a 0.3 instead of 0.2 because the median is ln(2)=0.693 of the mean. Masari claims miners starting taking advantage of effects from including the median. The following shows the 30,000 blocks with this algo. Masari target solvetime was 120 seconds, twice as fast and Sumokoin and Karbowanec .

I will edit this later to show results from Sumokoin with the above algo and Karbowanec with a pure SMA N=17.