Did you have the chance to check my code ?

Nice Kata, really fun to solve, so upvoting it.
My only problem is that my solution fails at the glider #4.

Glider 4
My solution                     Expected Result
 ▓▓░░░░                        ░░░░░░░░▓▓░░░░░░░░░░░░
 ░░▓▓▓▓                        ░░░░░░░░░░▓▓▓▓░░░░░░░░
 ▓▓▓▓░░                        ░░░░░░░░▓▓▓▓░░░░░░░░░░

The instructions are clear, the universe should be cropped around all living cells.
But it's clearly not the case in the expected result of the test.

If the other two are ranked 4kyu, then combining them can not be ranked lower than 4kyu. Instead it should not exist at all. :)

If I train and solve a Kata and my current level is 5kyu, then advance to level 4kyu before the Kata goes official. What credit will I get if the Kata is ranked level 5kyu?
More generally , what happens if I solve a Kata that will get ranked lower than my rank?

Good catch, didn't pay attention to it. Thank you, corrected. :)