Hello,
EasyEDA: 5.9.34
Autorouter: 0.8.1
The autorouter is able to get 100% with a simple PCB.
After adding a single double sided small KEEPOUT area (solid) which does not interfere with routes found before, it is no longer able to get 100%.
regards
Carsten
Chrome
72.0.3626.53
Windows
10
EasyEDA
5.9.34