Quads are much rarer, and so they’re much less helpful in a method due to the fact they don’t Allow you to slender down a large number of candidates all at once, however, if you see a person, it’s value investigating. Solving solitary squares may also transform quads into triples https://sudokuhard-hardsudoku23322.arwebo.com/49594918/little-known-facts-about-sudoku-hard-hard-sudoku