wif and check summ

[SalPhaseIon]

Honestly, I’m not very familiar with this I just wanted to clarify: what if I already know the exact checksum? The characters I’m looking for are the first nine in a row, like in the compressed WIF: L?????????5ipgK234…including the checksum I know. I thought that knowing the exact checksum might narrow down the number of possibilities. Or does your program not support filtering by checksum?
Sorry, my English is poor I’m using a translator.

[Coding-Enthusiast]

The problem is the size of the search-space that is massive. The program computes the double SHA256 hash of each permutation then compares it with the checksum. It has to do it 7.4 quadrillion times (9 missing) which makes it impractical.
You can check out other projects on GitHub that use a different approach that doesn't involve checksum and also use the GPU.