Mid-2013, just when we thought we had finally made it, we were directed to a wooden box buried in the sand.

Carelessly we opened it, and freed the nightmare of a very surprising and extremely intricate Ko. Quite obviously it must have been Pandora, who had lost this box. Only after the investment of another two years, and a further several hundred pages, we were able to close the lid again.

The printed version of our work has now about 1,100 pages.

You may enjoy the entire contents here.
Volume 1 ...

... contains the main path of our solution, and a very wild bunch of nested variations. In addition, various overviews are included, of which we hope that they clarify the structure of the problem.

Volume II ...

... begins with what we know about professional solutions to the problem.

The largest part is the detailed representation of the evolution of our investigations.

Finally, we explain some structural aspects of the problem.

Only for documentation purposes, we keep our "frozen" old site on here:

If you have any suggestions, questions or comments, please do not hesitate to contact us!

For this purpose, we have created an e-mail-account with gmail.com: igohatsuyoron120

We very much regret that it is beyond our technical capabilities to integrate here in place a forum or a blog.

Therefore, if you want to discuss in public, please be so kind to use the thread
"The most difficult problem ever. Igo Hatsuyoron 120" with Life in 19x19:

We will respond to you there.