TESTS FAIL. The technique actually works, by the way, but the tests erroneously fail. Removed some of the specific debug printing, but leave a little bit more to help me tweak the test case.
TESTS FAIL. The technique actually works, by the way, but the tests erroneously fail. Removed some of the specific debug printing, but leave a little bit more to help me tweak the test case.

jkomoros/sudoku,jkomoros/sudoku,jkomoros/sudoku