Sudoku-YAdvanced
Two-String Kite: connect a row and column through a box
One pair lies in a row and another in a column. A shared box can connect them and rule out a candidate at the far corner.
Check the conditions before the shape
The basic pattern tracks one digit with exactly two positions in a row and exactly two in a column. One distinct position from each pair shares a box. Those connecting positions cannot both hold the digit; the remaining ends give the common target. The argument alternates forced truth and exclusion.
HoDoKu — Single Digit Patterns · SudokuWiki — Weak and Strong Links
Our partial setup for digit 6
Row B permits 6 only at B2/B8, and column 3 only at C3/H3. Neither unit already contains 6. B2 and C3 connect in the top-left box. The remaining ends are B8 and H3.
H8 sees B8 in column 8 and H3 in row H. It need not see either connecting cell in the top-left box.
Two paths exclude H8
If B8 is 6, H8 cannot be 6. Otherwise row B forces B2=6, which excludes C3=6 in the box. Column 3 then forces H3=6, also excluding H8. Both paths reach the same elimination. These conditional values are not entries to copy into your game, and removing 6 does not tell us H8’s final value.
Do not ignore an extra position
If B5 also permits 6, rejecting B8 no longer forces B2. B5=6, C3=6 and H8=6 do not conflict with each other, giving a counterexample under the relaxed conditions. Recheck the entire source row and column before using the chain.
Two positions for one digit is different from two candidates in one cell. Our argument depends on where 6 can go, not on how many other digits are written in B2.
Try before revealing
Does adding candidate 2 at B2 break this kite, if every position for 6 stays unchanged?
Show explanation
No. This pattern tracks 6. Adding another digit in a source cell does not alter its two-position links. Adding a new position for 6 at B5 does.
Where to go next
The Classic 9×9 Techniques button now scans Skyscraper and Two-String Kite from your current entries, highlights the evidence and links to these lessons. Strong/Weak Links explain the connections used in those proofs; they are not a standalone elimination. Reading or revealing an answer here never changes your saved game.
Compare this connection with the Skyscraper diagram, then explain both paths in your own words. Looking back at the reasoning is fine. Understanding one elimination is more useful than collecting technique names.
References and further reading
Read the source explanations and compare them with our examples. Links are references, not endorsements or claims of affiliation.