Platon Sudoku · Sudoku Study
Coloring components · Core Concepts
Candidates connected by a path of strong links form one component. The letter A in a different component is an independent state.
This course is adapted from Platon Sudoku App. Read the complete example here, then continue learning and practising in the app.
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Candidates connected by a path of strong links form one component. The letter A in a different component is an independent state.
How to find it
Extend coloring along verified strong links until no new candidate connects, then start a new component.
Common mistake
Matching color labels alone cannot join two disconnected components.
2 nodes
Teaching board · local candidate diagram
Observe candidates
Candidates connected by a path of strong links form one component. The letter A in a different component is an independent state.
Verify the condition
Extend coloring along verified strong links until no new candidate connects, then start a new component.
● 1A: R2C2=2
■ 1B: R2C6=2
Draw the conclusion
The colored candidates connect through strong links and share one component.
● 1A: R2C2=2
■ 1B: R2C6=2
3 nodes
Teaching board · local candidate diagram
Observe candidates
Candidates connected by a path of strong links form one component. The letter A in a different component is an independent state.
Verify the condition
Extend coloring along verified strong links until no new candidate connects, then start a new component.
● 1A: R2C2=2, R5C6=2
■ 1B: R2C6=2
Draw the conclusion
The colored candidates connect through strong links and share one component.
● 1A: R2C2=2, R5C6=2
■ 1B: R2C6=2
4 nodes
Teaching board · local candidate diagram
Observe candidates
Candidates connected by a path of strong links form one component. The letter A in a different component is an independent state.
Verify the condition
Extend coloring along verified strong links until no new candidate connects, then start a new component.
● 1A: R2C2=2, R5C6=2
■ 1B: R2C6=2, R5C3=2
Draw the conclusion
The colored candidates connect through strong links and share one component.
● 1A: R2C2=2, R5C6=2
■ 1B: R2C6=2, R5C3=2
Recognition practice
Teaching board · local candidate diagram
Recognition practice 1
Do these colored candidates belong to one connected component?
● 1A: R2C2=2
■ 1B: R2C6=2
Draw the conclusion
Yes
Recognition practice 2
Do these colored candidates belong to one connected component?
● 1A: R2C2=2
■ 2B: R2C6=2
Draw the conclusion
No
Recognition practice 3
Do these colored candidates belong to one connected component?
● 1A: R2C2=2, R6C5=2
■ 1B: R6C2=2
Draw the conclusion
Yes
Recognition practice 4
Do these colored candidates belong to one connected component?
● 1A: R2C2=2
■ 1B: R6C2=2
● 2A: R6C5=2
Draw the conclusion
No
Recognition practice 5
Do these colored candidates belong to one connected component?
● 1A: R8C8=2, R5C4=2
■ 1B: R8C4=2, R5C7=2
Draw the conclusion
Yes
Recognition practice 6
Do these colored candidates belong to one connected component?
● 1A: R8C8=2
■ 1B: R8C4=2
● 2A: R5C4=2
■ 2B: R5C7=2
Draw the conclusion
No
Recognition practice 7
Do these colored candidates belong to one connected component?
● 1A: R8C8=2
■ 1B: R4C8=2
Draw the conclusion
Yes
Recognition practice 8
Do these colored candidates belong to one connected component?
● 1A: R8C8=2
■ 2B: R4C8=2
Draw the conclusion
No
Recognition practice 9
Do these colored candidates belong to one connected component?
● 1A: R2C8=2, R5C4=2
■ 1B: R2C4=2
Draw the conclusion
Yes
Recognition practice 10
Do these colored candidates belong to one connected component?
● 1A: R2C8=2
■ 1B: R2C4=2
● 2A: R5C4=2
Draw the conclusion
No
Recognition practice 11
Do these colored candidates belong to one connected component?
● 1A: R8C2=2, R5C6=2
■ 1B: R8C6=2, R5C3=2
Draw the conclusion
Yes
Recognition practice 12
Do these colored candidates belong to one connected component?
● 1A: R8C2=2
■ 1B: R8C6=2
● 2A: R5C6=2
■ 2B: R5C3=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