it is shorter.

Very well! Q.E.D. Dancing links from Algorithm X is the best solution!

My time is about 1350ms, I think there is still room for improvement:)

If it's slow, I won't try to do it, but thanks for the advice on how I can do this!

you can test my solution on your own: copy the full current test suite, open a fork of my solution, replace the full test suite with the current one, run the tests and look at the timing.

hint: it's slow.

I understood you. Copycats:Total war. :)

But, please Blind4Basics, send me the time of your solution "Hard Sudoku Solver" https://www.codewars.com/kata/5588bd9f28dbb06f43000085/discuss/python

Let's rather say it's "politness" toward codewars itself. If you drop the solutions in the easy kata, any user passing by can copy it and paste it in the hard version. Copycats are already a big problem, so please, don't add your share to it.

Is it rule?
But I don't want to start the hardest kata without testing the lightest kata!

It is not my fault that my simple kata solutions are capable of finding solutions for complex kata

but now that you know, you'll solve the hard kata first, and if your solution pass there, you won't post it on easier versions.

Ок. I returned back my first 5ku Kata solution. I just wanted to test speed of the new solution only.
I test my solutions on the easy versions before hard katas.

Blind4Basics, please send me the time of your solution "Hard Sudoku Solver" https://www.codewars.com/kata/5588bd9f28dbb06f43000085/discuss/python

Best regards!

PS It is not my fault that my simple kata solutions are capable of finding solutions for complex kata. I just think so.
Many people on this site think so and do so, I found many solutions on simple kata that are suitable for solving complex.

Could you please STOP to post your solutions to hard kata in the easy versions...? I already hid like 5-10 solutions of yours, because of this.

Sorry!
Python.

In which language?