This is a classic brain training puzzle that is popularly known as the Chinese Ring or the Nine Rings.
Nine notes are tangled around the bar, which requires considerable effort.
It is a ring of wisdom that cannot be easily solved.
Super-high difficulty of 256 hands at the shortest!
In the old book, “Sengoku Measures,” you will see the statement that “Aki no Oki gave Jade Ren Ring to Sai Koku”.
It is said that this “Tamaren ring” is the same kind of “Kyuren ring”, and there is a legend that “Kozora Ryo was devised to comfort the wife's innocence”.