Platon Sudoku · Sudoku Study
Two-color states · Core Concepts
Along strong links for one digit, alternate labels A and B. They represent opposite possible truth states.
This course is adapted from Platon Sudoku App. Read the complete example here, then continue learning and practising in the app.
View on Google PlayDefinition
Along strong links for one digit, alternate labels A and B. They represent opposite possible truth states.
How to find it
Start at a bilocation and alternate colors over verified strong links.
Common mistake
Colors are hypothetical, not placed values. Both ends of a strong link should not share one color.
2 nodes
Teaching board · local candidate diagram
Observe candidates
Along strong links for one digit, alternate labels A and B. They represent opposite possible truth states.
Verify the condition
Start at a bilocation and alternate colors over verified strong links.
● 1A: R2C2=2
■ 1B: R2C6=2
Draw the conclusion
A and B alternate across the strong link; colors are possible states, not placed values.
● 1A: R2C2=2
■ 1B: R2C6=2
3 nodes
Teaching board · local candidate diagram
Observe candidates
Along strong links for one digit, alternate labels A and B. They represent opposite possible truth states.
Verify the condition
Start at a bilocation and alternate colors over verified strong links.
● 1A: R2C2=2, R5C6=2
■ 1B: R2C6=2
Draw the conclusion
A and B alternate across the strong link; colors are possible states, not placed values.
● 1A: R2C2=2, R5C6=2
■ 1B: R2C6=2
4 nodes
Teaching board · local candidate diagram
Observe candidates
Along strong links for one digit, alternate labels A and B. They represent opposite possible truth states.
Verify the condition
Start at a bilocation and alternate colors over verified strong links.
● 1A: R2C2=2, R5C6=2
■ 1B: R2C6=2, R5C3=2
Draw the conclusion
A and B alternate across the strong link; colors are possible states, not placed values.
● 1A: R2C2=2, R5C6=2
■ 1B: R2C6=2, R5C3=2
Recognition practice
Teaching board · local candidate diagram
Recognition practice 1
Do the colors alternate correctly across the strong link?
● 1A: R2C2=2
■ 1B: R2C6=2
Draw the conclusion
Yes
Recognition practice 2
Do the colors alternate correctly across the strong link?
● 1A: R2C2=2, R2C6=2
Draw the conclusion
No
Recognition practice 3
Do the colors alternate correctly across the strong link?
● 1A: R2C2=2, R6C5=2
■ 1B: R6C2=2
Draw the conclusion
Yes
Recognition practice 4
Do the colors alternate correctly across the strong link?
● 1A: R2C2=2
■ 1B: R6C2=2, R6C5=2
Draw the conclusion
No
Recognition practice 5
Do the colors alternate correctly across the strong link?
● 1A: R8C8=2, R5C4=2
■ 1B: R8C4=2, R5C7=2
Draw the conclusion
Yes
Recognition practice 6
Do the colors alternate correctly across the strong link?
● 1A: R8C8=2, R5C4=2, R5C7=2
■ 1B: R8C4=2
Draw the conclusion
No
Recognition practice 7
Do the colors alternate correctly across the strong link?
● 1A: R8C8=2
■ 1B: R4C8=2
Draw the conclusion
Yes
Recognition practice 8
Do the colors alternate correctly across the strong link?
● 1A: R8C8=2, R4C8=2
Draw the conclusion
No
Recognition practice 9
Do the colors alternate correctly across the strong link?
● 1A: R2C8=2, R5C4=2
■ 1B: R2C4=2
Draw the conclusion
Yes
Recognition practice 10
Do the colors alternate correctly across the strong link?
● 1A: R2C8=2
■ 1B: R2C4=2, R5C4=2
Draw the conclusion
No
Recognition practice 11
Do the colors alternate correctly across the strong link?
● 1A: R8C2=2, R5C6=2
■ 1B: R8C6=2, R5C3=2
Draw the conclusion
Yes
Recognition practice 12
Do the colors alternate correctly across the strong link?
● 1A: R8C2=2, R5C6=2, R5C3=2
■ 1B: R8C6=2
Draw the conclusion
No
Practice
This course is adapted from Platon Sudoku App. Read the complete example here, then continue learning and practising in the app.
View on Google Play