Kakuro
Kakuro Sum 17 — All 2-Cell Combinations
Updated June 10, 2026 · 2 min read
A 2-cell Kakuro run with a clue of 17 has 1 valid combination. Each cell must contain a unique digit from 1 to 9, no repeats.
Forced combination. A 2-cell run summing to 17 can only use digits 8, 9. Both values are fixed — only their order within the run remains.
Valid combinations
| Digits (any order) | Sum |
|---|
| 8 + 9 | = 17 |
What you know immediately
The digits 8, 9 appear in every valid combination — certain in this run regardless of which combination applies.
Digits 1, 2, 3, 4, 5, 6, 7 never appear in any valid combination — eliminate them immediately from all intersecting clues.
Why this clue is special
Seventeen over two cells is the highest 2-cell clue that exists (18 would need 9+9) and it's forced to 8 and 9. Spot the pairing with 16-in-two: a shared cell between them is always the 9. And if a 17-in-two crosses a low run like 6-in-three or 7-in-three, the position is contradictory — neither 8 nor 9 belongs to those low combinations — which is a quick way to catch a misplaced digit earlier in your solve.
Solving with this clue
- Cross out combinations made impossible by digits already placed in the run
- Find digits present in all remaining combinations — those are certain placements
- Find digits absent from all remaining combinations — remove from intersecting clues
- When one combination remains, all digits in the run are determined
Use intersections: A shared cell must satisfy both its row clue and column clue. Digits that don't appear in valid combinations for either clue are eliminated. This cross-elimination often reduces options to one quickly.
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