Every technique, on a board that actually has one
Most guides draw a tidy diagram. These use positions pulled from real games — every number can be checked against the candidates.
-
Beginner
Naked Single
One empty cell, one surviving candidate. It is the simplest move in sudoku, and the one most often confused with its cousin.
Read → -
Intermediate
Hidden Pair
When 4 and 6 can only live in the same two cells, those cells are theirs — and everything else pencilled into them is noise.
Read → -
Advanced
X-Wing
Four cells in a rectangle, one digit, and a guarantee strong enough to cross out candidates in two whole lines.
Read →