October 16, 2013. Difficulty rose by +41.45% to 267.73M from 189.28M.
Change
+41.45%
New difficulty
267.73M
Period length
9.9 days
Network hashrate then (7-day)
0.0 EH/s
Bitcoin price then
$141
Hashprice then
$239,567/PH/day
The 2,016 blocks before it took 9.9 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 41.45%: 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.