By the way, I checked the hardness of the knives using special files. On all knives the hardness is approximately 55 HRC. The 55 HRC needle file left scratches, the 60 HRC needle file scratched confidently. I think that's why all 3 Busse passed the tests and didn't break. I consider this hardness to be ideal (no more than 58 HRC).
I also ordered a knife made of steel 8670 folklore beast. and I asked the master to make a hardness of 58 HRC. I want to test it too. I think hardness 60 and 61 is too high. on Dr. Larin's chart, this steel is practically the strongest