Yes, I described the brute force approach on the entire range like I mentioned from the start just to give an idea of the magnitude of the scanning process.

I didn't know how Kangaroo works. (I admit, I didn't used it, just compiled once last year to see how it works, but quit using it, as I was involved only in puzzle 66).

Now after I read something on JLP Kangaroo's readme on github and how it works , you are right, but still requires enough power to do 2^66.05 operations per second, that's ~ 750 GK/s, so you still need 100 x RTX 4090 to maximize your chances to find it faster than anyone else, but that's a serious env which costs goes over the benefits if you do not find it in 2 Months or less.