October 6, 2013. Difficulty rose by +27.19% to 189.28M from 148.82M.
Change
+27.19%
New difficulty
189.28M
Period length
11.0 days
Network hashrate then (7-day)
0.0 EH/s
Bitcoin price then
$121
Hashprice then
$319,571/PH/day
The 2,016 blocks before it took 11.0 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 27.19%: one of the largest adjustments on record. For every machine on the network that is a pay cut of the same size until the next retarget.