Platon Sudoku · Sudoku Study

Exhaustive branches · Core Concepts

Every possible starting value needs a branch. Cells with two, three or four candidates need two, three or four branches.

This course is adapted from Platon Sudoku App. Read the complete example here, then continue learning and practising in the app.

Definition

Every possible starting value needs a branch. Cells with two, three or four candidates need two, three or four branches.

Count all starting candidates and make one exclusive branch for each possible value.

Omitting a third value leaves a gap, even if the first two branches agree.

Teaching board · local candidate diagram

Observe candidates

Every possible starting value needs a branch. Cells with two, three or four candidates need two, three or four branches.

Verify the condition

Count all starting candidates and make one exclusive branch for each possible value.

Draw the conclusion

Every candidate in the starting cell has its own checked branch, covering all possible values.

Branch A: checked · Branch B: checked

Teaching board · local candidate diagram

Observe candidates

Every possible starting value needs a branch. Cells with two, three or four candidates need two, three or four branches.

Verify the condition

Count all starting candidates and make one exclusive branch for each possible value.

Draw the conclusion

Every candidate in the starting cell has its own checked branch, covering all possible values.

Branch A: checked · Branch B: checked · Branch C: checked

Teaching board · local candidate diagram

Observe candidates

Every possible starting value needs a branch. Cells with two, three or four candidates need two, three or four branches.

Verify the condition

Count all starting candidates and make one exclusive branch for each possible value.

Draw the conclusion

Every candidate in the starting cell has its own checked branch, covering all possible values.

Branch A: checked · Branch B: checked · Branch C: checked · Branch D: checked