Platon Sudoku · Sudoku Study

Bilocations and conjugate pairs · Core Concepts

When a digit has exactly two places in a row, column or box, those positions form a conjugate pair.

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

Definition

When a digit has exactly two places in a row, column or box, those positions form a conjugate pair.

Fix one digit and count all its positions throughout the chosen region.

Count one digit in two cells, not two digits in one cell. A third place breaks the pair.

Teaching board · local candidate diagram

Observe candidates

When a digit has exactly two places in a row, column or box, those positions form a conjugate pair.

Verify the condition

Fix one digit and count all its positions throughout the chosen region.

Draw the conclusion

The marked row, column or box has only two places for this digit: a bilocation.

Teaching board · local candidate diagram

Observe candidates

When a digit has exactly two places in a row, column or box, those positions form a conjugate pair.

Verify the condition

Fix one digit and count all its positions throughout the chosen region.

Draw the conclusion

The marked row, column or box has only two places for this digit: a bilocation.

Teaching board · local candidate diagram

Observe candidates

When a digit has exactly two places in a row, column or box, those positions form a conjugate pair.

Verify the condition

Fix one digit and count all its positions throughout the chosen region.

Draw the conclusion

The marked row, column or box has only two places for this digit: a bilocation.