Willow 3.1 is released! Estimated ELO is about 3300 CCRL 40/15, or 3400 CCRL Blitz, which places it right on the edge of the top 50 engines (and makes it by far the strongest mailbox engine in the world). The style might be slightly watered down simply due to increasing strength, but I've put in some effort to ensure that it's still significantly more aggressive than other engines its strength.
Willow technically supports SMP, and it gains plenty of ELO, but I would suggest to not test it multithreaded for a few days until I verify that there are absolutely no crashes going on
https://github.com/Adam-Kulju/Willow/releases/tag/3.1