This kata asks you to solve sudoku that require guessing and to throw errors if there's more than one solution.
Disregard my comment
If I am reading the test suite correctly, there's 100 random test cases, each of them with length of the pattern generated as l <- floor(runif(1, 0, 11)). As much as I am unable to read R, I still believe you can expect a couple of test cases of length 9 or 10.
l <- floor(runif(1, 0, 11))
Without spoiling anything - how fast does my code have too be to pass the attempt? I've got an R-script that takes ~5s to run "E" 9 at the moment and its just not cutting the mustard.