I have developed a new tool to solve #66:

- ONLY CPU / highly optimized for speed and about 30% faster (on my CPU) than the fastest tool i know
- ONLY LINUX x86_64 / there is no and NEVER will be a WINDOWS/MAC version (DO NOT ASK!!!), but it may run on Windows Subsystem for Linux (WSL) / not tested
- SPECIAL SEARCH ALGORITHM/LOGIC that allows resuming search and has a higher chance to find the key (sucessfully tested on the solved puzzles!) / no stupid random or incremental search
- DUE TO LEGAL REASONS PRECOMPILED/PRECONFIGURED FOR #66 / i will release an update for #67 once #66 is solved

In short:
My tool is afaik the best option if you have access to one or more modern powerfull multicore CPUs and want to solve #66.
It still will not be easy to solve #66, but at least your chance to solve it will be higher!
All i ask you for is to split the reward (50:50) with me, if you use my tool.

If you are interested: the download link is in my profile.

NOTE: For anything regarding this tool leave me a private message! It may take some time, but i will try to answer all messages - thanks!